When was she born? She seems small, but not dangerously skinny from what I can tell in the pics. If you can see a lot of spine sticking up, then you're nearing the danger zone. She doesn't appear to be there yet, just based on the pics.
You have a baseline weight now, so I'd say if she starts losing weight drastically, then start to worry. I think once you get your husbandry dialed in and she has time to settle (no handling until 3 meals down), she will be on-track weight-wise.