Bobbi Kristina on Whitney's Relationship With Oprah: "[She] Was Loyal to My Mom"

With Bobbi Kristina's first interview with Oprah set to air on Sunday at 9 p.m. on OWN

, TMZ scooped a few brief words from Whitney's daughter.

“Oprah was loyal to my mom, and never did my mother wrong, or made her look bad,” Bobbi told friends. “She always looked out for my mom.”

Bobbi will address hearsay surrounding her mother’s death in her exclusive interview with Oprah. The host was a close friend of Whitney’s, said TMZ, and was one of the first to reach out to Bobbi following her death.

TMZ also reported that several anonymous individuals have called the L.A. County Coroner’s Office, claiming to be relatives of Whitney Houston and Bobby Brown and suggesting Whitney was murdered.

According to TMZ, one of them believes a family member may have been behind the supposed murder, but had no proof to support the claim.

The Coroner’s Office has yet to indentify the callers, and said the official cause of Whitney’s death will not be released until toxicology results are analyzed.

As of now, no further comment has been made regarding the issue. – Stephanie Long