Mayufu now has the chance to start over in this new town completely independent of the others, right? Forget her feelings and move on to something new. Not like she has a chance anyway lol
Jokes aside, good on her realizing quick that it wasn't malicious on his part, but I definitely get the turmoil she's going through. Seeing your own wish play out like that for someone else right in front of you, when you already know the object of your affections is dense as fuck kind to everyone, is not an easy pill to swallow.
Good thing she dropped her petal bag so she can invariably be found right when it matters and she can have her own "make-up" ad hoc moment with onii-chan.