As long as she is eating and pottying normal and her behavior seems to be alright, I do not see a problem waiting until tomorrow. She may have slightly injured herself - jumping, going upstairs.... Does she have any old injuries that could produce arthritis? It could be something like that to make her "touchy".
I would let her rest and keep your normal routine today. I wish you the best of luck at your visit tomorrow - hope all is fine with her.
Let us know if you need further assistance!
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Oliver's Mom

