Hard to say what has happened. May have broke some lines.
You could put a heater inside the camper, open the cabinets and spaces where lines are present and wait a while B4 blowing out the lines.
Then when you blow them out, have someone inside to look for
leaks and you look outside for leeks.
Then add some RV Antifreze and when summer comes, look again for RED leeks this time.
One thing is that the plastic lines may not have ruptured (Just buldged) if you're lucky.