Brumation, which is a form of hibernation, could be a possibility. The reason I haven't mentioned it yet is because (1)most snakes in brumation aren't very active and you said Simba was, (2)brumation is hard to prove out.

Some snakes go through a non-eating phase that can last up to several months but not usually at such a young age/size. Boas, in particular may, I can't remember since it's been so long since I've kept them. Some people call this phase a form of brumation. Snakes can be somewhat active during this time.

My troubleshooting philosophy is based on the process of elimination, eliminate obvious possibilities first and then move on to the not so obvious possibilities.

About the only things I can think of at the moment would be to make sure you have a good, proper temperature gradient in its enclosure and keep the temps towards the high end of the recommneded range. I would also not handle Simba for several days and then try feeding again.

One more question: Simba hasn't been laying with her head elevated or breathing heavy, has she? Just would like to rule out respiratory infection along with the other things that seem to have been ruled out.

Best wishes!
HH
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Due to political correctness run amuck,
this ol' hillbilly is now referred to as an:
Appalachian American

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