Help hog island boa won't eat.

[Trevor Flink]

So I picked up a hog island boa from a breeder on the 9th of October. She was feeding on live fuzzy mice every tuesday there and the guy said that she would switch over to frozen/thawed no problem. It has been 4 days since she she was scheduled to eat and she hasn't yet. She has peed once with 2 white flakes but no poop. She has lost weight. Her ambient temp is 82°f and humidity at 50%. What am i doing wrong.