Underweight rescued BP

[pretends2bnormal]

Agreed, not sure rabbits are smart. BPs don't generally get big enough for it, much less a skinny one.
Smallest rabbits I've seen sold are 1/2 pound, which is equivalent to a large rat. No one really recommends feeding large rats to even very large female BPs.

For this one, I'd suggest you start small and work it up.
Weigh her after she digests to get a baseline. Then feed based on that.

I'd offer for the first 3-5 meals a small rat if she weighs 1,000-1,500g before moving on to mediums like a female that weight would typically be fed. Maybe start 1-2 meals with a weaned rat if she really is skinnier than the pictures show.

If shes over 1,500g and this skinny, then you would probably be okay to do 1-2 small rat meals (one rat at each meal, just that many meals) and move up to mediums.

You don't want to overwhelm the digestive system of a snake that is starving and probably hasn't eaten in quite a few months. Give it some time to get digestion running smoothly with easier to digest meals to start. A normal feeding schedule is generally plenty to bulk a snake back up to a good weight and rushing can be dangerous to them. It will take some time, but slow and steady wins the race here.

You may even want to do the first few meals 2 weeks apart to help that. Not necessarily the mouse from this time, but the larger prey like the rats I mentioned above.

Kudos to you for helping the poor girl out, she's beautiful and looks like she will come back just fine.
I'm working with a rescued BP who was underweight also, but she started as a tiny juvenile and not an adult.

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