How To Treat Scabies Leading To Red Rashes All Over The Body?

My daughter is 11 yrs old. About three weeks ago she started having a red rash on her face followed by a couple bumps around her mouth that looked like acne. The next day she woke up it had spread to her back and arms. It has been three weeks now and it has spread pretty much all over her body. She itches like crazy constantly. She has been to Drs twice, first told she had contact dermatitis and to take an antihistamine and put hydrocortisone cream on the affected areas. We did this....a week later still no better. Took her to Drs last week and she said it was scabies. She was prescribed a cream (cant remember name) and was told to put it all over her body from neck down and wash all her bedding. We did this too....it s been four days and still not any better. I have googled everything and I just don t know what it could be.