The aunt of Bobbi Kristina Brown is vowing that her death will not be "in vain," and that the fight for justice for her and mom Whitney Houston "has just begun."

Leolah Brown, the sister of Bobbi Kristina's father Bobby Brown, took to Facebook on Friday, saying, "Its been a tough trial & journey for me. However, it has just begun! But as always -- I'm keeping my faith in God! And I will make sure that my sister Whitney Houston Brown and my niece Bobbi Kristina Brown has not left us in vain! HANG IN THERE WITH ME."

Bobbi Kristina, 22, died on July 26, some six months after she was found face down in a bathtub of cold water at the Atlanta area home she shared with boyfriend Nick Gordon. She never regained consciousness and has since been buried alongside her mom at a New Jersey cemetery.

Leolah's pledge comes at a time when authorities have launched a criminal probe into the circumstances surrounding Bobbi Kristina's injuries that reportedly targets Gordon as a primary suspect.

The Daily Mail has reported, Gordon is suspected of cheating on the only daughter born to Whitney and Bobby, and may have even been with another woman on the morning she was rushed to a hospital emergency room.

The woman in question has since been identified as Danyela Bradley, a friend of Bobbi Kristina's, who reportedly was at the home of the deceased on the morning she was hospitalized. Bradley herself was later seen being pushed around in a wheelchair by Gordon at that same North Fulton hospital.

Reportedly, Bradley is also the same "white girl" named in an amended, multimillion wrongful death suit filed against Gordon by the conservator of Bobbi Kristina's estate Bedelia Hargrove.

Specifically, the suit alleges that Bradley overheard Gordon abusing Whitney Houston's daughter just moments before she required emergency medical attention. It also alleges that Gordon gave Bobbi Kristina a "toxic cocktail" that morning, which effectively rendered her defenseless.