Rumer Willis’ nickname, “Rue,” can be heard on the 911 call that was made when mom Demi Moore was suffering a seizure after “smoking something” — and on Tuesday a source was confirming that Rumer was indeed present during the emergency.

With “a few people” still around from a birthday party Demi had been hosting, Rumer and a couple of friends were in another part of the house when the seizure occurred, a source told E! News.

According to the 911 call, which had specifics about substances edited out, Moore had “smoked something” that was “not marijuana, it’s like incense.” (Hear the full 911 call, placed on Jan. 23, below.)

Speculation about what she might have smoked has included mention of “spice” or “K2″ and other herbal incense products, which are often laced with designer drugs and can “quite often” result in seizure activity, according to a doctor who spoke with ABC News. Salvia, which has hallucinogenic effects, is also sometimes marketed as herbal incense.

While Moore’s whereabouts remain uncertain, Willis on Sunday night hit the official gala after the Screen Actors Guild Awards with Annie Starke, Glenn Close’s daughter.

Keeping it low-key, Rumer greeted same-aged thesps, including cast members from “Glee,” staying tight with her friend and stargazing.

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Juan Sharma, PacificCoastNews.com

Well, at least one of our five lingering questions has been answered.

A source confirmed to E! News that Demi Moore‘s daughter Rumer Willis was in the house the night of Moore’s emergency medical situation, and was indeed the person referred to as “Rue” by the male on the 911 call.

MORE: Five Lingering Mysteries From Demi Moore’s 911 Emergency

“Hey, Rue, what’s the name at the gate so that we can buzz them in from here?” a man is heard saying during the call.

Rumer, along with a couple friends, was in another part of the house when her mom suffered her seizure.

Our source claims that “a few people” from the birthday party Moore had been hosting were left in the house at the time she went into convulsions, but only one girlfriend witnessed Demi’s initial episode after the star “smoked something.”

MORE: Demi Undergoes “Spiritual Counseling”

Since her mother’s health scare, however, Rumer hasn’t exactly been keeping a low profile. The 23-year-old was twice spotted at the hospital where Demi was treated last week prior to her release, and was even caught by paparazzi smoking a cigarette and looking distraught outside the facility.

Meanwhile, over the weekend, while Moore was beginning her spiritual counseling, Rumer and her sister Tallulah made the rounds at the Four Seasons spa in Beverly Hills Saturday afternoon. Sunday night, Rumer rejoined Glenn Close and daughter Annie Starke at a Screen Actors Guild Award afterparty at the Chateau Marmont.

Must have been nice company: she also dined with them on Saturday night.

The 23-year-old daughter of Demi Moore and Bruce Willis looked glum in the wake of her mum’s collapse as she stocked up on essentials at a pet store.

And she held up the novelty handbag, with the outline of a pistol moulded on the side, as a symbol of strength in the family’s hour of need.

Demi was rushed to hospital last week after friends called an ambulance when she suffered a fit.

A recording of the 911 call revealed that the actress was held down after she suffered convulsions, and Rumer was thought to be one of those present in the house.

The frantic caller also revealed that Demi had smoked an unspecified substance before the collapse.

She told the operator: “She smoked something. It’s not marijuana.

“It’s similar to incense and she seems to be having convulsions of some sort.”

The 49-year-old split with husband Ashton Kutcher over his alleged fling with Sarah Leal, 23, on the couple’s sixth wedding anniversary in September.

Since then, Demi has appeared increasingly thin and frail, and concerned friends claimed she had replaced food with cans of caffeine drink Red Bull.

After her admittance to hospital, a spokeswoman for the Ghost star said: “Demi has chosen to seek professional assistance to treat her exhaustion and improve her health.”

Director Patty Jenkins insisted at the weekend that Demi is ‘doing great.’

Speaking at the Directors Guild Awards, she said “I just saw her and she’s doing great.

“I think she’s doing much better than it’s made out to be.”

“Demi is awesome and so strong. I also hate when people make it a bigger drama than what is going on.

“She’s great.”

Less than a week after her mother was rushed to the hospital, the ‘Sorority Row’ actress is spotted stepping out to attend the after-party for 2012 Screen Actors Guild Awards.

has returned to the party scene just days after her mother’s hospital scare, but she made sure she avoided any spotlights. The oldest daughter of and was seen attending the after-party for the 18th Annual Screen Actors Guild Awards on Sunday, January 29 night.

According to Us Weekly, the 23-year-old snuck into the party held in a tent outside the Shrine Auditorium in Los Angeles. An eyewitness sais, “Rumer was like an apparition – she just slipped in with a friend and then was gone. She looked like she was walking on eggshells…She was just weaving through the crowd.” The source added, “She definitely didn’t want anyone to see her.”

PEOPLE additionally reported that Rumer was joined by ‘s daughter, Annie Starke at the party, where they sipped champagne. They allegedly spent a lot of time trying to get a glimpse of and . Before leaving, Rumer shared a hug with “” actor , who also gave her a kiss on the cheek.

Rumer’s night of partying didn’t stop there though. The “” actress was later spotted making a stop at the Chateau Marmont in West Hollywood. One partygoer told Celebuzz, “Rumer looked great and seemed to be in really good spirits. She spent the evening chatting with Glenn Close and held court at a table on the patio with a girlfriend as well as Chris Lowell from ”.”

While Rumer was in the party mood, her actress mother was seeking professional help after her recent hospitalization. The whereabout of ‘s estranged wife remains undisclosed, but sources close to her told E! News that the “” star has been receiving some sort of “spiritual counseling.”

Moore after a 911 call was made at 10:45 P.M. on Monday, January 23 night. It was said that she was taken to the hospital after paramedics assessed her condition for a half hour. has since been released to public, hinting that Rumer was present when Moore was “shaking, convulsing” from smoking an unknown substance.