According to Gray Hughes' episode (April 2, 2020) with caller "Debbie" (friend of Tiffany and her family), several days prior to Tiffany's "disappearance", there was an altercation between Tiffany and the boyfriend at his home. Tiffany had left her vehicle behind at her boyfriend's that night, and (presumably, according to Debbie) had been picked up and driven back to her mother's home.
The night that Tiffany "disappeared", a female had picked Tiffany up at her mother's home where she had been living. She was to meet her boyfriend at a local McDonald's on Morgan Rd. (5 miles from where Tiffany's body was located) to discuss "the baby." That female has been questioned repeatedly and denies any knowledge -- of anything -- to include denying that she picked Tiffany up that night.
Debbie also stated that following the altercation, Tiffany was "kicked out" of the boyfriend's home, her personal belongings were relegated to a different room in the boyfriend's home, and a "new female with a daughter" was installed in Tiffany's former place. All of this occurred prior to Tiffany's "mysterious" disappearance.
Debbie said that her information comes from what Tiffany's mother witnessed when she went to the boyfriend's home the day after Tiffany [was] "disappeared."