In a statement, her aunt Pat Houston said Whitney Houston's daughter's "condition has continued to deteriorate" and Brown was moved to hospice care Wednesday.
Brown, 22, was found face down and unresponsive in a bathtub in her Atlanta area home on Jan. 31. She underwent surgery to replace her breathing tube with a tracheostomy tube in February.
The statement added the Houston family thanks "everyone for their support and prayers. She is in God's hands now."
Brown is also the daughter of singer Bobby Brown.