For those of you who believe the world's gorn mad.... let me just tell you this:
It only takes a tiny whiff of someone saying "peter's mum touched my bum when I was in the bathroom" (cleaning up diarrhoea) for it to be misinterpreted by the other mum.... and the whispering starts.
Better not have an unsupervised child in your house, let alone where she is taking down her pants.
I'm not in any way saying the child will make a false allegation, nor am I an apologist for pedophillia, but children sometimes tell their mum only a tiny part of a story, and it explodes into a life of its own.
It is a safeguarding issue. Your safety too, not just the child's!
If you've never experienced anything like it, well and good, and hurray for you, but for those of us who have had to learn the hard way about what children say and what parents think they say, then back off with your PC gorn mad comments, and accept, you don't know everything.
Some of us have been there and have had the unpleasant experiences you haven't had, which is why we advise caution.
Op let the little girl go home to her own loo.
It's it's her parent's responsibility to see she doesn't wet herself. If she does when she's out of her own house unsupervised, then you're not to blame. You have your own kids to look after.