Sorry - I didn't mean to put you on the defensive - bites happen - even the most docile of snakes can get pissy sometimes - my first snake was well over 20 years old the first time he bit me - I had some choice words for him when he did! I've since learned that they (like most living creatures I supposed) get cranky with age too.
Point being there are more opportune times to handle your snake - understandably you were trying to help but snakes don't have that kind of brain capacity - you were simply bothering her while she was uncomfortable and resting so she was telling you to piss off.
As for the rescue - well it's going to happen - when I take in rescues they don't even see me for severeal months except for feedings and cage changings or if they need meds. I just let them settle in, get comfortable and get into a routine once they realize that they are safe and secure and there is a meal coming soon they become puppy dogs.
Anyway hope this helps.
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Tosha 
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7.33.0 Ball Python (Harry and Fluffy and gang)
1.0.0 Angolan Python (Anakin Skywalker)
0.0.1 Green Tree Python
0.2.0 Feline (Pippen and Pandora)
0.0.1 Dessert Tortoise (Pope John Paul aka JP )
2.2.1 Fish (1,2,3,4)
0.0.2 frogs rescued from pool skimmer