Alex Reid tells E! News her dying pal called her three weeks before she was found face down and unresponsive in a bathtub at the Atlanta home she shared with boyfriend Nick Gordon and appeared to be scared and upset.
In her exclusive interview, which will air on TV in America on Wednesday night (01Jul15), Reid claims Bobbi Kristina was hiding from Gordon in her late mother's closet.
She recalls, "She was sobbing. Nick had hit her and she was scared. She was very upset. She didn't know what to do. It was as if she didn't have anyone else to turn to. It was heartbreaking."
Reid explains she has kept her last conversation with Brown to herself until now because she didn't want to betray her friend, but adds, "As she lies there, I feel there is no one else to speak on her behalf. I feel like I have to be a voice for her now."
Brown's California-based friend admits she never witnessed Gordon abusing his girlfriend, but Bobbi Kristina would "FaceTime me every time she was distraught, when something had just happened - or show me a bruise."
Police are still investigating Brown's final hours and Reid believes she can help them fill in some blanks, adding, "There are things that I know that no one else does and I hope that by speaking out I can help the investigation in some way."
She reveals she tried to persuade Bobbi Kristina to leave Gordon on multiple occasions, but says, "It was a desperate love. She felt like she couldn't do anything without him.
"She said she didn't blame Nick, she blamed his temper. It was just that he couldn't control it. She didn't think it was his fault."
And Reid reveals her pal felt there was no one in her family she could turn to as she was no longer close to her dad Bobby and her relationship with Gordon had driven other relatives away.
She adds, "All Bobbi Kristina wanted was to be taken care of, and all everyone seemed to do was the opposite."
Reid's exclusive interview comes a week after Brown's conservator served her boyfriend with legal papers, accusing him of abusing the 22 year old and stealing funds from her bank account while she battled for life following her near-drowning incident in January.
Just hours after her family revealed she had been moved into hospice care on 24 June (15), court-appointed conservator Bedelia C. Hargrove filed a $10 million (£6.2 million) suit against Gordon in Atlanta's Fulton County Superior Court.
In the documents, Gordon is accused of assault, battery and intentional infliction of emotional distress.