Bobbi Kristina Brown is being supported by her family who have described her as a "tiger".
Her cousin Jerod Brown told NBC News that she was having a "hard time" as the third anniversary of her mother's death approached.
"She's been through a lot, you know what I'm saying. This is a hard time, it's her mother's anniversary of her death. It's been a hard time, it's a rough time of year," Brown said.
"But she's a tiger, she's going to pull through it."
TMZ reported that Ms Brown's husband Nick Gordon and a friend found her in the bath at the house in Roswell, north of Atlanta, and performed CPR on the 21-year-old until emergency services arrived.
After taking over life-saving measures, an ambulance crew rushed Ms Brown to North Fulton Hospital, where doctors stabilized her breathing, according to Atlanta's WSB-TV.
It is unclear how Ms Brown fell unconscious. Police are investigating the scene.Reuse content