She definitely seems big for her age but doesn't look too overweight. As others have suggested I would switch to a medium rat every 2-3 weeks. For reference my 2-3 year old female boas are in the 2-4ft range, not sure on their average weight off the top of my head, and they usually get fed a medium rat every 2-3 weeks. My female boas that are 4+ get a large rat every 3-4 weeks, most of them are between 5-7ft. I typically feed more frequently from March-September, and start going longer or skipping the occasional meal from October-February. That isn't necessary though, plenty of people use the same feeding schedule year round.
Also seconding hook training. Boas tend to have a strong feeding response and mine always act hungry a week after a meal, some of them act hungry the day after, lol. So before taking any of them out of their cage I just tap them on the head with the hook so they know it's not feeding time.
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