Could appealing FA decision result in LESS aid?

My daughter got into several schools, and her top choice gave her $3k less in aid than the next lowest amount. So I’m asking for a review. However, the school is asking for my 2018 1040, which shows that my income actually increased by 15k. Since they will count about 20% of parental income, this seems like it will be a wash right? And is it even possible that they would actually then give her LESS aid? Or would I just be able to revert to the original offer?

Possible? Yes.