You have bubbles in your beer line and your glass of water froze correct?
If your PSI setting was still 13psi and you never had it lowered while you were that cold, it's possible you over-carbonated your keg.
Bubbles rising through the beer line indicate CO2 breaking out of solution.
Turn off CO2, release pressure on keg via safety valve and shake keg up a few times releasing CO2 in between times, then turn CO2 back on and let keg settle. Might not work though but is worth a try.
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