There are things you can try to get her switched to frozen/thawed. You can put the rodent into a paper bag with her and leave it for several hours. Also, I'd make sure the thawed rodent has some heat in it because part of the way a python finds it's pray is to use it's heat sensors and if it suddenly doesn't have that heat to sense it may not recognize only the smell.
A more humane way to kill a rodent is if you have access to dry ice. Get a tall container of some sort, put some warm water in a smaller container and place it into the bigger container. Drop some dry ice into the water and put the rodent in the bigger container. The CO2(I think) will kill the rodent w/out it suffering. I couldn't slam it against a wall either.
Oh yeah, another thing you can try with f/t is to expose the brain matter and then try to feed it. It's not as difficult banging an already dead rodent to expose it's brain as a live one.
FYI, read some care sheets on the net and you will probably find additional ways to get the to switch from live to f/t.
Good luck!!!
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Rob Talkington