According to reports Bobbi Kristina's bff-play-brother-boyfriend Nick Gordon tried unsuccessfully to get her to sign over her rights using power of attorney...
From Forbes
My source says that right after Houston died, Gordon tried to convince Bobbi Kristina to sign over her power of attorney to him. “Luckily, it was stopped,” says the source. “But Nick Gordon definitely wants his hands on Bobbi Kristina’s money.” Bobbi Kristina now stands as the sole heir to an estate that includes a devalued mansion for sale in New Jersey (now listed for $1.7 million).