Whitney Houston's Daughter Bobbi Kristina -- Family Fears She Might Be Suicidal

In the wake of the death of Whitney Houston, family members fear that her daughter, 18-year-old Bobbi Kristina Brown, might be suicidal and are considering getting her help ... TMZ has learned.

As TMZ first reported, Bobbi Kristina was taken to the hospital once last night and again this morning. We've been told she was "hysterical, exhausted and inconsolable."

Sources close to the family tell TMZ ... the family believes she might try and take her own life. According to one source, the family feels Bobbi Kristina needs help and they are considering rehab as an option.