First, get the tank temp back up. They usually need warmer water for reproduction. Second, keep a really close eye on her. I know they don't like sudden temperature changes, but it also could be a sign of illness. If she doesn't recover with the warmer water you "might" need to medicate the tank. That could be hard on her too, since she's pregnant. Hopefully someone who breeds guppies in here can help you out more.
Hiding isn't completely unusual with a pregnant fish, but if she stops eating completely for more than a few days...that also could be the sign of something wrong.
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