You can try always offering the live mouse with use of forceps so she reconises the tool when you give her the thawed version. in my opinion you should be killing the mouse just before feeding so that she doen't get an unneeded injury.
Chain feeding can also work well. feed her a smaller mouse(fuzzy or small hopper) as she is just finishing it put the thawed mouse at the tail end of the one about to be consumed and the snake will take it just like it was part of the first one offered. after it has a taste of a thawed mouse it will recocnize it as food. Sometimes this takes a few trys and doesn't work with all animals.
Also make sure the meals aren't to big, some prefer smaller meal than what they could eat.
I have a female that should be eating small hopper that will only eat pinkies(not even fuzzies)I haven't tried to change her diet yet but will soon.

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