First I would not recommend rat at this point, the first thing you want to do is have her to eat for you.
Because of the picture I assume that you feed outside the enclosure? So next time offer in the enclosure.
I would also suggest a live mouse (f/t right now is not a priority)
You need to let that animal settle in her new enclosure for a week during that time, no handling.
When you will switch to f/t don't mess around with the prey dropping them picking them up and reheating them, offer with tongs and only let go if the snake strike and coil. If it does not happen leave the prey in the enclosure overnight.
Based on info given about your other snake my guess is that the prey is not warm enough.
Finally how big is your enclosure and can you give details on your husbandry?
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