I went through the same thing with my Sorcha when I brought her home. She absolutely refused f/t no matter what methods I used for heating it up and offering it to her. I finally caved after 5 weeks and gave her a live fuzzy. It took her a whole of 2.5 seconds to strike and constrict.

I too was concerned with feeding live as there are so many horror stories about how mice can hurt your snake. However, while dealing with fuzzies I wouldn't be overly concerned. In my experiences, Sorcha strikes so fast and so hard that the fuzzy never even has a chance to react let alone try to bite.

My girl is 19.5" long. Her home is a 29 gallon aquarium. I've had many tell me that it's too big for her but she seems to like it just fine. I've never noticed her acting intimidated or overwhelmed by the size. I'm sure it makes a difference though that I have it very naturalized and cluttered up for her with fake vines, plants, hides, etc.

I'd recommend offering her live. Like some previous responders have said you can always try later on to switch her back on to f/t. I also recommend just feeding her in her normal home until she becomes more used to you, her surroundings and eating on a regular schedule.

Good luck and let us know how it goes!