Ah, yes, more suckiness yet to happen...
... Her coming by this morning unannounced was the last straw. She's the one that left, she's no longer on the lease, and I will no longer put up with her having unfettered access to my home. The locks have now been re-keyed, as I warned her last night. She'll just have to deal with getting her stuff when I'm available to let her in, not whenever the hell she wants to. She won't be pleased when she comes to pick up Theo this evening, and that's not my concern...