My daughters friend has lice, which my dd and myself now have........
I met the mum and asked if she knew. Yes and she was dealing with it. She then starts looking through her youngest hair, complaining about these "centipede looking little bugs in her hair"
I said that she probably has lice too. Pretty obvious in my opinion really.
"No, these are just bugs from the garden" she said 
She has told me she shampooed once with Nit shampoo, but hasn't used a nit comb or treated anyone else int he family.
Needless to say dd and I have head lice now. 
I am really annoyed that she didn't tell me about dd when they played together twice last week AND she isn't dealing with the situation.
How to I tell her that her kids can't play with mine?
How do I know they don't have lice without doing a head check at the door?