Oh dear. Poor you (both). This has happened to us a couple of times and, whilst it seems like the end of the world at the time, I can’t even remember the children who did the not inviting now.
When the kids were younger I always went the other way and slightly (ahem) controlled the guest list. Mostly because I wanted the mums I liked to be staying! Luckily my kids were fairly pliable
I do think giving young kids that sort of responsibility (especially a few weeks before the party when everything can change so easily) is asking for trouble.
Best of luck and, as one post said, it’ll all be forgotten (by your daughter anyway...) very soon.