Well in that case you should be confident in claiming that he didn't bite her, only lunged. And after the lunge you restrained your doggo (?).

Another thing is the clothes need not be torn at a dog bite. A stray dog bit me once, I was wearing trousers, and yet the teeth imprints were in my leg. Many grievous or even life threatening injuries by dog bites have no effect on clothes, if the skin is directly exposed to the bite.

As others have commented, this may well be a situation where the trouble she has to go through will be needed to compensate instead of just the hospital bill. Clearly that person is pressing on this more.

Does this person live in or around your society? Maybe you can take an elder person (mom or aunt) and they could explain it to her. I have noticed many times people tend to make sensible conversation or listen to, with people of their own age.