She's beautiful, kudos for taking her in as a rescue!
By the pictures she looks to be at a perfect size to me; baby boas are quite slender and bulk up with age; I would say she's at a good size for a yearling. But pictures can be misleading, I know. In any case, she's not dangerously underweight and it sounds like she's a good eater (most boas are), so she'll gain it all back in no time. However, I would urge you to feed her no more often than every 7 days. Even if she does need to put on weight, overfeeding can stress the digestive system and do more harm than good for a recovering baby. Also, boas are prone to obesity which causes fatty liver disease. So the longer she stays somewhat slender the better!
x2 on the Bedatine bath. If it's only just developing that may nip it in the bud. If it's already set in you may need to seek a vet and get some antibiotics.
She is a Colombian boa of the Boa constrictor imperator subspecies.
Good luck with her, and please keep us updated!
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