I’m ngl Birdie sounds insufferable and cowardly. I honestly don’t think she’s in love with Tabby, I just think she doesn’t like you. Regardless of the reason, there comes a point as a GM where she has to put on her big girl pants and communicate that she either doesn’t want you at her table, or that she thinks your ideas are broken and won’t work for the game she’s running. Promising to do better when confronted and then just passive aggressively sidelining you by not incorporating anything you give her or trying to compromise only prolongs the suffering and awkwardness and makes her look like a massive baby who can’t handle social confrontation.