that's difficult to answer. it depends on the type of mold, how long it's been in there, and the health of the animal. 

most of us (and our pets) breathe in thousands of mold spores every day - especially those people like me, that live in Seattle :)  a healthy immune system will kill the spores and you never know the difference.

the exceptions would be if it were a long-term exposure, or if your animal is immunocompromised, or if it's a particularly toxic type of mold.

anyways, if it's been a short amount of time and your animal is healthy, it will probably be fine. I keep my animals largely in naturalistic setups and every now and then I see a little mold - around a water dish, in a gecko's food dish, etc. your snake will probably be ok. just maybe boost the temps for a little while to promote immune function in case she's fighting off any illness and keep a close eye on her for symptoms.

I have a baby PRB the same size as your Naga... from time to time I will find a tiny bit of mold.  It seems impossible not to with the high, high humidity they require.  I have, however, found less since switching to a EcoEarth/Cypress combo substrate.. with a little moss on top and  a bit in one of his hides.  Hardly ever find it now.  I check him daily.  I wouldn't worry too much, as you found it and remedied it quickly.  I know they are said to be resistant against scale rot... unlike other boas.  Perhaps the rest of them is resistant due to their necessary living conditions?  I would just pay attention, as you are. :)

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