Did she defecate prior to you weighing her that time? That might be your issue. If she defecates regularly prior to you weighing her then I’m not sure. The only reason I can think of is that she might still be digesting.
As well, a 4 month old bp that’s 270g-330g sounds to either be quite large or overweight. That’s their typical weight when about 7-9 months old. I’d check her overall body condition. She should have a somewhat slender tail and a slight point at the top, but should not be super triangular. If she has a great body condition then I wouldn’t worry, she might just be a large female. A photo of her would be helpful. It just sounds quite odd, but you also mentioned you are unsure of your snakes age.
How often are you feeding her and what?
I’d also like to ask, do you notice any swelling or feel strange lumps on the underside of her belly? I’d do it after she completely digests her meal, but something more serious could be going on and I’d check for any abnormalities to be safe.
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