Owner thinks I abused kitten?

I was sitting a kitten, shy at first but warmed up to me. Nothing eventful or out of the ordinary. After the kitten was returned the owner sent me a picture of the cat’s anus. There seems to be some scabbing, and she said “what did you do to my cats anus”???

A quick Google search says it might be a number of issues, but she seems to think there’s some foul play? I told her I didn’t notice anything wrong behavior wise or with her stool, though I wasn’t closely inspecting the cat’s anus…and didn’t do anything to her kitten. I followed up by asking how the kitten is doing and she hasn’t responded. Not sure what else to tell her. Should I follow up again or prep for some sort of crazy accusation by contacting Rover in advance?

Update: Thanks everyone for the responses! I contacted Rover and the only advice they provided is “if” she leaves a bad review, that I respond to it politely and factually. Hopefully she just takes the kitty to a Vet and that alleviates her concerns.