I haven't kept snakes that large in years, but I just wanted to add that I agree with the observations by bcr229. At her size and weight I think I'd be feeding her something like a small rabbit (about 1 lb.). Between that and some good exercise to get her muscle tone improved I think you'd see some weight gain, less lethargy and improved body condition.
For immediate enrichment I'd throw a sturdy step ladder into that enclosure and a couple of big cardboard boxes for her to explore. In the longer term I'd want to get a couple of big ledges in there for her just to start.
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