Whitney Houston’s daughter on a ventilator, source says

“It is going to be a waiting game,” said the source.

Brown “was not breathing” when a man identified as her husband found her Saturday morning inside her townhouse in the Atlanta suburb.

He called 911 and performed CPR until emergency crews arrived and took over, said police spokeswoman Lisa Holland.

The spokeswoman said when Brown was found, she was “unresponsive, meaning not breathing, no heartbeat.”

In scanner traffic, emergency services could be heard describing an “ECHO-level response” — urgent and life threatening — with “possible cardiac arrest.”

“Twenty-one-year-old female in the bathtub, facedown. PD’s (police department’s) en route.”

Brown was taken to a local hospital, where “she is still alive and breathing. Other than that, I don’t know her condition,” Holland said Saturday.

It was unclear whether Gordon came home Saturday morning to find his wife in the bathtub or if he had been in another part of the house overnight, Holland said.

Police have obtained a search warrant to look through the house, but that’s standard procedure, she said.

Concern for Brown surged again after news broke.

Music director Michael Bearden sent along “healing energy to the daughter of a late great friend.” Songwriter Diane Warren tweeted, “I hope Bobbi Kristina gets the help she needs.”

“Poor thing,” Warren wrote. “Almost 3 yrs to the day her mom passed and the same thing almost happened to her.”

CNN’s Lisa Respers France and Nick Valencia contributed to this report.

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