Just hours after her mother's funeral Bobbi Kristina Brown was found using drugs, media reports say.

The 18-year-old daughter of Whitney Houston and Bobby Brown apparently disappeared while family and friends convened to a restaurant in Newark, New Jersey to remember the 48-year-old musical legend.

"Everyone was freaking out and calling Bobbi Kristina's cell," a source told The Daily Beast.

It was so much commotion and activity after the funeral that Bobbi Kristina just slipped away. Ms. Cissy [Houston, Whitney's mother] was beside herself."

"There was some confusion about Bobbi Kristina's whereabouts last night for a short time, but she's OK," a Houston family spokesperson told The Daily Beast.

"She needed some time alone." The spokesperson said Bobbi Kristina wasn't on drugs and was just emotionally fragile at this time.

"She is going through a very hard time as you can expect."

Bobbi Kristina's grandmother Cissy Houston also wouldn't admit that her grand-daughter had a drug problem.  

"But they know it and have been trying to keep her straight even before Whitney passed. But losing your mother and the life you're accustomed to all in one day is enough to send anybody off the deep end," the source said.

The report says, that before the funeral the family had serious discussions about Bobbi Kristina entering into rehab as soon as her mother was laid to rest.

Bobbi Kristina had already a stint in rehab for drug problem early last year, one of the family friends told the magazine.

Houston's daughter was rushed to hospital twice in the days after her mother's death and treated for 'anxiety and stress."

- © Fairfax NZ News