I have a 7 month old indian runner female that seems to be in distress. We had a cold snap (-30 to -40), so for a couple days I kept my two ducks in their heated coop. Today it finally warmed up but my female seems reluctant to move. She stayed in the coop for 5 hours laying down. Now she is out in the barn and is standing under the heat lamp. She looks disheveled and doesn't move unless my male bothers her to much or if I startle her. She isn't shivering or fluffed up, seems to be breathing normally and can keep her head up and walk normally. She may be straining towards the back end, but I don't think she has a egg stuck because she laid one this morning. I am unsure how much she has had to eat or drink today but I have seen her drink a couple times. Anyone have a idea about what could be wrong?