Every year we have a small Christmas party for close friends and family. Last year my relationship with a good friend broke down and I haven't spoken to her since except in passing.
But I'm also friends with her mum and they both usually come to the party. It was unlikely the mum would come alone (she lives out of town and doesn't like night driving, also she'd understandably be upset if I excluded her daughter) so I sent an invitation for both of them, to the mum's house.
But the mum is ill and can't come, however my ex-friend has RSVP'd saying thanks for invite, she'd love to come! I really, really don't want her there, I only invited her in order not to upset her mum and so the mum would come.
I don't know what to do. Should I just suck it up, be polite and friendly at the party because after all I did invite her. Or WIBU to tell her the truth, that she's not welcome (without her mum) because I'm still hurt by her behaviour and do not want to resume our friendship?