Lice in my 3 year old

My almost 3 year old has lice she got it from the babysitters house. I am so mad and sad. I haven’t stopped crying since I found them. I called her pediatrician last night at 11:30 pm to see what I can do. We went to Walmart last night too but the lice kit. Not just waiting for her to wake up. I have not slept all night. I’ve been washing everything in the house. Nurse said they like clean hair.