Our expert says:
Children can, of course, lie, even about something as serious as this, but such a comment, in the context you describe, is highly inlikely to be a lie, and one can't think of a motive for her to lie about this. It's possible, I suppose, that she is telling the truth but not describing abuse, if grandpa has needed to help her change after she wet herself, for instance.
Best to take her to see a good local child psychologist or child psychiatrist for assessment, to help clarify what may have happened.
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