Worth taking her to the drs to get checked. A similar thing happened to my DD, she was intermittently crying and saying it hurt and grabbing her nappy, she didn't have a temp initially but got one about 5 days later, turned out she had a UTI and was promptly treated. The Dr told me a common cause of UTI's is dehydration, so given she has just had gastro she might have got a bit dehydrated and a bug got in.
If it is a UTI, better to get onto it sooner rather than later to save any kidney damage. It might be nothing, but no harm in doing a urine sample. (besides that fact it is an absolute pain to collect!)
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