Sounds like you allowed the temps to drop too soon, not something you want to do if you are trying to feed a female up to size
Males don't mind the drop and in my experience it helps males start breeding a bit easier, but if the female isn't to size dropping temps can certainly throw them off feed.
I like a good hot spot for the snake to lay on to help digest faster and take in more food, without that they tend to slow down eating since digesting slows down.