First off, you aren't handling her are you? Because you shouldn't handle a new snake (no more than absolutely necessary to clean cage) until it has fed preferably 3
times easily for you and at normal intervals. She just refused food but she probably wasn't hungry yet either, after eating a large rat only last week. That
AND being in a new place, I'd have been surprised if she did eat this time.
If that was my snake, I'd wait 2 weeks & see IF she seems hungry (by cruising cage at night or by staying in her hide & just peeking out at night...remember these are
ambush predators); ONLY IF she seems hungry then would I offer, & then only a small or medium rat. If she doesn't behave as if she's hungry, wait another week & see
if she seems hungry yet...by then she might even be in a shed cycle (& if she is, don't offer, just wait until after she sheds). OK?
By the way, when you offer f/t prey it should be immediately warmed up just before you offer it...did you do that? I'm not surprised that when you left it
in the cage over-night that it wasn't eaten...it would have cooled off & with no motion either, it would not likely appeal to a snake that is used to eating
live (though you never know- snakes have various "opinions"). Don't be surprised if you have to work at it some to get her eating f/t...but it's really important that you do, for her health & safety.