Would there be any harm in just waiting a week or two until she sheds, and then re-evaluate? Don't feed, just keep her temps correct and her humidity up. Sometimes snakes will "hold it" until they shed, then they take care of everything at once.
You also may want to back off of her feeding schedule. My female is just a few inches bigger and takes a jumbo rat every 4 weeks. If you're feeding XL's perhaps try one every two weeks.
ETA: Has she passed any urates recently?
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