Ok , it sounds like there are a few things that can be tweaked. Pictures of the actual setup and snake would be great.

Your ambient temps in the enclosure should be in the low 80's but she should have a hot spot of 90. There is no need to drop the temps at night.
Incorrect temps can be a factor in food refusal.

Also from the sound of her the mice you are giving her might be too large. They should be about the same diameter as the largest part of her body. When she eats them they should make a noticeable bump but they should not be so large that she struggles to get them down.

Try keeping her in a nice, quite corner of your house. Provide lots of clutter and hides in the tank so that she feels safe. For feeding as long as she has struck and coiled the mouse she will be fine to leave alone and eat in peace. However, you should never leave a live rodent unattended with the snake. Oftentimes the snake will become the prey and get chewed on.

Hopefully this helps and you get your little one eating again.