Brown, 21, "was not breathing" when a man identified as her husband found her Saturday morning inside her townhouse in the Atlanta suburb of Roswell, Georgia.
He called 911 and performed CPR until public safety officers arrived and took over, said police spokeswoman Lisa Holland.
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.
Nobody knows what caused Brown's unresponsiveness, Holland said, but police consider it a medical incident at this time. She said investigators had found nothing to indicate it was drug- or alcohol-related.
Police had been to the residence recently. Somebody reported a fight there January 23, but nobody answered the door and officers found no evidence of an altercation, Holland said.
The police spokeswoman noted one oddity in the case: "Her mother died in the very same manner."
Three years ago, Houston was found dead in a bathtub at the Beverly Hilton on February 11, hours before she was to attend a pre-Grammys bash.
Kristina Brown is Whitney's only child. An autopsy later revealed that she'd drowned facedown in "extremely hot water" about 12 inches deep. The Los Angeles County coroner ruled it an accidental drowning with the "effects of atherosclerotic heart disease and cocaine use" as contributing factors.
"She encourages me and inspires me," Houston once said of her daughter. "When I look at her eyes and I see myself, I go, 'OK. I can do this. I can do this.'
Kristina was born in 1993 during Houston's marriage to R&B singer Bobby Brown, which ended in divorce in 2007.
The daughter of music royalty became a public figure during the mid-2000s reality show "Being Bobby Brown," in which she frequently appeared alongside her parents and often had a front-row seat to their marital fireworks.
Mother and daughter even performed together on national TV in 2009, when the two sang "My Love Is Your Love" in Central Park on ABC's "Good Morning America."
Given the pair's close relationship, it's no surprise that Houston's death was a major blow.
Days after her mother's body was found, a grieving Bobbi Kristina -- then 18 -- was taken to Cedars-Sinai Medical Center because she was "overwhelmed," family friend Kim Burrell said.
"She loves hard," Burrell said then of Bobbi Kristina. "She's going to be OK, and we're going to see to it."
Married a man who was taken in by Houston
Brown appeared on episodes of Lifetime's brief reality show "The Houstons: On Our Own," which followed her life after Houston's death.
One of that reality show's storylines revolved around Brown's relationship with Nick Gordon, who lived with Houston and her daughter from the age of 12.
And in January 2014, she tweeted out a picture of wedding rings, presumably belonging to her and Gordon, along with the words, #HappilyMarried• SO#Inlove."
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