The 21-year-old aspiring singer - the daughter of Bobby Brown and the late Whitney Houston - was taken off some medications to bring her back to consciousness on Wednesday but began having seizures so doctors had to put her back on the drugs.
A source told People magazine: "This is a horrible setback. Everyone was hopeful that this was the sign that she'd turned the corner. We were so optimistic.
"Bobby is taking this so hard; he was sure this was going to be a good day. But please, everyone needs to pray for Krissi. I don't care what religion you are, or if you have no religion at all. Send your thoughts, your prayers, your well-wishes. Send everything you've got. Please."
Bobbi was placed in a medically-induced coma after she was found unresponsive in a bathtub at her home in Atlanta on 31 January and it is believed her medical team wanted to bring her round in an attempt to get a sense of how well her brain is functioning.
Meanwhile, the starlet's boyfriend Nick Gordon has slammed her family on Twitter for continuing to block his attempts to visit her.
My heart is full of angry after the Browns have shut me out they don't even know her. Sabotage.— Nick Gordon (@nickdgordon) February 25, 2015
My heart is full of angry after the Browns have shut me out they don't even know her. Sabotage.
I miss her so much I seem so weak right now— Nick Gordon (@nickdgordon) February 25, 2015
I miss her so much I seem so weak right now
You all have been so supportive! Thank you for everything.— Nick Gordon (@nickdgordon) February 25, 2015
You all have been so supportive! Thank you for everything.
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