I didn't see this myself. Have you done the other recent event involving her (
the Amazing Trio)? I didn't seem to have any trouble getting to 24 points after completing that event. If you've done that already but still can't progress, have you tried saving the game and just adding a point to her score with
a Ren'Py save editor? Normally I wouldn't recommend doing that, but if there's just a bug so you can't gain affection with her, I'd consider manually adjusting her affection (
lp is the stat for her points).