It's DD1's 11th birthday on Saturday. We're having a sleep over on Friday night. Letting her invite all the girls, because there are only 5 or 6 of them in her class

Problem is that there is one girl she's not sure about. And its not for good reason IMO. This girl has bladder problems & wets herself at school. She's in year 5. Her & DD aren't very close, because she is younger. Other than that she's a good kid, no other reason for anyone to have a problem, but of course, when you're 11/12 its a problem

DD knows that its not fair to not invite her, but she's thinking noone will come if she does invite her. I know at least 3 of the girls won't care, one I'm not sure about & the last ones mother will most likely accept that as a good enough reason not to come, even though her DD & mine are friends. Then the way she has ner nose in the air lately her DD probably won't come anyway.

I don't wanna be a horrible mum, & make her invite someone she doesn't like, but I don't want the other girl to be the only one not invited.

What do I do?