Credit: Paul Zimmerman/Getty Images

As new details emerge about Whitney Houston's death, loved ones are concerned about how her daughter, Bobbi Kristina Brown, is holding up.

The results from Houston's autopsy, released March 22, reveal that the "I Will Always Love You" singer (who passed away in her Los Angeles hotel room February 11) had cocaine in her system at the time of her death. Just four days after the shocking news broke, dad Bobby Brown was arrested March 26 for a DUI.

"Everyone is worried about Bobbi," a source tells Us Weekly of the hard-partying 19-year-old, who friends and family say is in danger of following in her parents footsteps. (Bobbi Kristina was hospitalized for stress following the news of her mother's passing, and went missing after Houston's February 18 funeral.)

Since her mother's tragic death, Bobbi Kristina has found comfort in the arms of her "adopted" brother, Nick Gordon (Houston informally adopted Gordon when he was 12, and raised the two as brother and sister). The pair even sparked engagement rumors when Bobbi Kristina stepped out in Atlanta recently wearing a ring that once belonged to her mom, although a rep for the Houston family insists Bobbi Kristina and Gordon are not engaged.

Though friends and family are doing their best to support Bobbi Kristina as she grieves her mother's death, "Bobbi just doesn't want anyone's help," the insider shares. "She's lost."