Why not just tell her that you didn't want her kid that close?
I’m really shy and I’m not good at talking to people and I have a tendency to “tip-toe” around strangers.
Like, what if I told the mom that and she retaliates? I don’t like conflict and I dunno how I would be able to handle the situation without crying. And even then, what if she gets mad at me? I know I shouldn’t care what people think, but it still doesn’t feel good.