My first BP! But is she too thin?

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I'm so excited to finally have my first ball python, Nessie! When I was researching getting a BP, I contacted an acquaintance of mine who I knew owned one and asked some questions. She told me that she was actually looking to re-home hers and, after meeting this noodle and falling in love with her, I ended up taking her home! She's around 2.5 years old and I just weighed her at 1360.

I'm concerned that she's too thin. Her previous owner told me that she was a poor eater and also that she only offered every 3ish weeks. She didn't keep records though. I know her husbandry wasn't great: only one hide, no thermostat, hardly any substrate, tank was empty other than one hide and water dish. I've had her for 4 weeks now and she's eaten both of the times I've offered, both times a medium rat. Though I don't think she had eaten for 5 or 6 weeks when I offered the first time. Her previous owner said she had been feeding large rats, but that seemed too large according to some charts I've seen. She also said Nessie would only eat live. Both times she ate for me it was fresh killed.

Could you all look at these photos and let me know if you think she's underweight? And if she is, what you would recommend as a feeding schedule? She has an indentation that runs next to much of her spine and I tried to get photos to show it. (I'm also curious about morph - Pastel maybe?)

Thanks so much for your help!

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