EXCLUSIVE: Valerie Harper Rushed to Hospital, 'It Doesn't Look Good,' Source Says

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Valerie Harper suffered a health emergency Wednesday night, when she was taken away by ambulance during a performance of her musical Nice Work If You Can Get It at the Ogunquit Playhouse in Maine.
The fire department confirms to ET that they received a call at 8:56 p.m. about an unconscious 75-year-old female backstage, and that she was taken to York Hospital. According to Ron Corning, anchor and correspondent at ET's affiliate in Dallas WFAA, around 9:40 p.m., the artistic director of the musical announced to the audience that the ambulance seen on the side of the lawn was for the 75-year-old actress, and that she had fallen ill and wouldn't be performing.
WATCH: Valerie Harper on Cheating Death After Cancer Diagnosis
The director then said, "She wants all of you to know after some fluids and rest she hopes to be right back here on stage later this week."
However, a source close to the situation tells ET, "It doesn't look good."
Corning also spoke to the art tech on site, who said that Valerie has not been well all week.
The Ogunquit Playhouse said in a statement on Thursday that Valerie is now "resting comfortably" and will remain in the hospital for observation.
"Valerie Harper was taken to a local hospital as a precaution before her July 29 evening performance of Nice Work If You Can Get It, at the Ogunquit Playhouse, after reporting that she was not feeling well," Bradford T. Kenney, Executive Artistic Director, said. "She is resting comfortably and will remain in the hospital for observation for the time being. .... The audiences and all of us here at the Playhouse are greatly enjoying our time with Valerie here in Ogunquit, and we are encouraged that she is feeling better."
NEWS: Jason Bateman Issues Touching Message to Terminally Ill Valerie Harper
The Mary Tyler Moore Show star only appears in the second act of the play, and is set to perform through August 15.
Valerie was diagnosed with terminal brain cancer in 2013, after previously beating lung cancer in 2009. In April, she told ET that her cancer has not spread to other parts of her body, though pointed out that contrary to reports, she has not been "cured."
"In a way, it's a positive thing to know that a year's gone by and it's nowhere else in my body," she said. "So I am cancer free from the neck down, so far."
WATCH: Valerie Harper Sets the Record Straight on False Cancer Report
Watch below: