But her doctors denied that her health has deteriorated and one doctor was more upbeat saying she's "doing quite well."
Pham, 26, and Amber Vinson, 29, are both nurses who have contracted the lethal virus after helping to care for Thomas Duncan, a Liberian man who died of Ebola in a Dallas hospital.
Vinson has been transferred to Emory University Hospital in Atlanta and Pham arrived Thursday night at the National Institutes for Health facility in Maryland.
Pham was listed in good condition when she left Dallas, and shared a YouTube video in which she joked with her doctor.
But Dr. Anthony Fauci, director of the NIH's Institute for Allergies and Infectious Diseases, said today "her condition is fair, stable.. she's resting comfortably."
Fauci declined to say why she was listed in fair condition, but said she had endured a long trip from Dallas.
"She's not deteriorating," Fauci said. He said she is sitting up and "she still has some symptoms" of Ebola.
"She’s very fatigued. This is a disease that wreaks havoc on you... This virus knocks you out," he said.
Dr. Richard Davy added, "She’s interacting with the staff, she’s eating... I really think she’s doing quite well."
New information emerged today about Vinson's actions before she boarded a commercial plane from Cleveland to Dallas the day before she was diagnosed with Ebola.
Vinson did not directly call federal health officials for permission to board a passenger flight Monday, instead talking to a team of Texas health officials who relayed her symptoms to the Centers for Disease Control and Prevention, her uncle told ABC News.
“They called Amber back and told her, ‘The CDC is OK with it. You can travel,'” Lawrence Vinson said today.
Vinson said his niece would not have traveled if she had been worried about her condition.
“Amber is one of the most conscientious individuals I know, and she certainly would not have done anything to put the other passengers on that plane or her family at risk,” he said. “Amber flew home and went home. If she felt ill, she would have gone straight to the hospital.”
People who entered Ebola patient Thomas Duncan’s hospital room are being directed not to go to public places such as grocery stores, or travel by plane, ship or train for 21 days after exposure, officials said Thursday night.
The travel restriction was instituted because of Vinson’s situation, authorities acknowledged.
“The direction comes after a health care worker involved in Duncan's care had been on a flight shortly before diagnosis of the disease,” a statement by the Texas Department of State Health Services reads.
CDC officials said Thursday they are looking into a new timeline for Vinson’s symptoms, with the possibility that she was exhibiting symptoms for days before she sought medical attention.
"[We have] started to look at the possibility that she had symptoms going back as far as Saturday ... which has to do with the bridal shop. But some more information that’s come through recently, we can’t rule out that she might have had the start of her illness Friday,” Dr. Chris Braden of the CDC said. “We need to back now to the flight on [Oct.] 10th to give our investigation the right context.”
Vinson took a Frontier Airlines plane from Dallas to Cleveland Oct. 10. Three days later, she returned to Dallas on another Frontier Airlines flight. Because of a slightly elevated temperature – 99.5 degrees – she reported the condition before boarding, but it fell below the 100.4 reading for a fever, so she was allowed to board. A fever is one of the symptoms of Ebola, along with diarrhea, vomiting and abdominal pain.
Vinson arrived at Texas Health Presbyterian Hospital Tuesday morning with a fever and was diagnosed with Ebola in the early hours of Wednesday. She was relocated to Emory University Hospital's isolation unit in Atlanta Wednesday night.
Texas Health Presbyterian has been the subject of criticism for alleged missteps and not getting accurate information out fast enough in the cases. Texas Health Presbyterian's transparency increased as they hired Burson-Marsteller, a global public relations and communications firm. Burson-Marsteller was brought in a week ago, on Friday, to help the hospital manage their Ebola crisis.
The situation with Vinson has prompted Frontier Airlines to contact passengers on seven flights, two flights the nurse took, and five other flights involving the same planes.
Vinson’s mother, Debra Berry, says her daughter was thrown into a mode of “extreme precaution and fear” after Pham was diagnosed with Ebola, and that her daughter wasn’t symptomatic when she traveled from Ohio to Dallas.
Berry classified her daughter as “caring, selfless and committed” in a statement to ABC News.