If the temperature dropped in the home too the water retained within the pump and the units lower assembly may froze which may have cracked which woul leak heavily. It mat be by chance too that the seal within the pump has failed. If it leaks only when the pump runs chances are the seal may be out; if however it leaks with nothing running it may be a crack. Another spot to check is the fill solenoid. You need to get underneath it or pull it out to determine where the leak is coming from.
I hope this may have helped,
Tom
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