How would the girls handle if, weeks and New Year after the Crusaders confessed being the culprits behind Anon-a-Miss happened the last semester at CHS, Pinkie Pie says she's still upset with the younger girls?

Sure, Pinkie is aware that despite them creating the profile, it was her own actions in leaving Sunset Shimmer and not believe the former unicorn - hurting her in the meantime - wich becane a constant reminder of both the party planner's guilt and the Crusaders' guilt.

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I feel like they would question it at first but after pinkie gives an explanation they’d understand.

I think it's understandable. Even though Pinkie and the others chose to leave Sunset in the first place, that doesn't erase the fact that the Crusaders were the ones who kicked everything off.