Possible Lice Exposure

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So my sister found out last night that while her and her daughter were at her friends this last weekend their was a little girl with lice. I watch my niece Thursday's and Friday's after school. My sister didnt tell me about this until after i was already watching my niece with my 2 boys! So far there are no signs of lice on my niece...how long does it take before you're considered in the clear? And also do i have a reason to be upset that she didn't tell me before, so i still had to watch her or am i overreacting?!

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