Whitney Houston's daughter, Bobbi Kristina Brown apparently disappeared after her mother's funeral on Saturday and was found "using drugs" in a hotel room, American website The Daily Beast is reporting.

According to the site, the Houston family were considering sending the 18-year-old to rehab for an alleged second time before she was found on Saturday night.

"Cissy [Whitney's mother] and others won't admit out loud that Bobbi Kristina has a drug problem", a family source allegedly told the website.

"But they know it and have been trying to keep her straight even before her mother passed. But losing your mother and the life you're accustomed to in one day is enough to send anyone over the edge."

Bobbi reportedly received treatment for cocaine addiction last year after a picture of her with the drug leaked online.

While a spokesperson for the Houston family confirmed that their was "confusion" over the teen's whereabouts for a short time on Saturday night, they denied claims that she's using drugs.

Bobbi Christina has been thrown in to the spotlight following the death of her mother a week ago.

She has reportedly been treated in hospital twice as she struggles to cope.

Her father, Whitney's ex-husband, Bobby Brown appeared to walk out of the funeral service on Saturday.