It honestly sounded to me like it could have been either; I heard the "bi" sound and not the "Bae" sound, but I also didn't hear a "tch" at the end, it sounded like it stopped after the vowel. IMO she started to say, "She's such a bitch," but caught herself before finishing the word, hence plausible deniability. It could have been "babe," said with a slight accent or lazy fat pronunciation where they don't bother to make their vowel sounds clear--like, she could have said, "She's such a beb," if you know what I mean? I cannot believe I am spending even thirty seconds trying to do some sort of forensic linguistic analysis here, lol. But I like Brie (don't know who the fat is but she's clearly horrid).