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You can give Minnie a baby aspirin and it should not hurt her. Some pets with sensitive stomachs can have minor issues with the medication. I will tell you that typically it isn't as good for pain in dogs as it can be in people. If you truly think she has slowed down due to pain you should get into the vet to get either Carprofen (Rimadyl) or Tramadol. If you choose to give the aspirin watch for a decrease in appetite - if that occurs it's not worth the risk. If you decide later to put her on carprofen she will need to be off of the aspirin for at least 7 days. Hope that helps.
Glad she's well! :)