If she's like most ball pythons, if you overdue it she'll simply refuse a week here or there. They are pretty good at self-regulating but since it's better for them and for us to stay to a nice regular feeding routine, try to avoid triggering those fasts.

I'd say she'd probably do quite nicely for you on a properly size prey item offered once a week. Just pick a day that works for you and pretty quickly she'll have figured out the routine and be coiled there, primed and ready to eat on that night.

She's 250 grams now. What prey type and size are you offering her at present?

Also never compare to anyone else's snakes. All snakes grow at different rates, all keepers feed their own ways so 1 to 1 comparisons tend to be apples and oranges. Look for general patterns....as in most 07's are between this and this size more than specifics. A broader group helps you see the overall patterns of growth I think.