Senior Year Musical Help

[GetBackUp25]

My drama teacher has announced the tentative senior year spring musical and apparently she's somehow able to have us do Mamma Mia!
If this is true (and if it isn't, I'll let you know what the show actually is), I would absolutely love to be Donna but I need your help.

In terms of showing Donna's character, I think anything from The Last Five Years would be perfect, particularly A Summer In Ohio. However, something tells me it might not be the right type of music to audition for a show like this with.

Would A Summer In Ohio be a good audition song for Donna? If not, what would?

It can't be anything from Footloose (because that's what we did this year) or Xanadu (because I used the title song from that to audition for Ariel in Footloose)