I got mine as an adult as well, of unknown age. I am guessing she is older based on how dull her scales are.
While mine will eat with no problems even during a shed, around this time of year, Nibbler begins to slow down. She will take the mouse if I put it in front of her face. Otherwise, she is not active in her enclosure and spends the majority of her time sleeping. As we progress into winter, her behavior changes into where she don't want to be bothered. I can poke her with a mouse all day and she would 'shrug' it off and sometimes let out a little hiss.
So to answer your questions, imo, go ahead and switch her over to her new enclosure. However, focus more on adding hides than decor because she may just want to be left alone, at least, for the first 2 weeks and see how active she is. Unlike bp, if your snake is as big as mine (about 4.5 feet), then that extra floor space will eventually be used. Offer feeding every other week. After she settles down in her new cage, watch for any signs of her flicking her tongue a lot when you open the cage door, moving around a lot especially dusk or dawn, etc.
I would keep offering f/t at least 2 more times before trying live. Make sure to warm it up properly. If it won't take it from you, leave it on a plate and let her decide.
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