It probably would be too warm, I'm glad you were able to get her out of the pond and to safety. I have to say this where do your 2 young geese Lucy and her brother sleep when the pond is frozen? if you have predators around they are in grave danger and not being able to retreat to the water makes it double dangerous. I have house for all my flock my geese, ducks and chickens,all have separate housing, I couldn't leave them out over night even 1 time we have all kinds of predators.Thanks so much for asking. As expected, I was up multiple times during the night listening for any problems. At 2:30am I looked out the door and saw a fox (most likely the one that OPENED my chicken coop door and ate my rooster last week)...He is SLY. He was hanging over the water....My geese are used to my small dog, so I think they thought he was harmless. Needless to say I was out there in a heartbeat and coaxed Lucy (my girl goose)out of the pond. I put her in the garage for the rest of the night. This morning I brought Lucky (brother) in with her, but when I went to check on them he was wandering around the garage picking at my husband expensive car....(He would freak out if he knew). So- needless to say, he is outside with the "wild" crew. The pond is almost frozen again (it had thawed yesterday) so now he has to figure out how to maneuver the ice again. I hope he ok. Lucy is mostly resting. She still has barely eaten and barely poops, but she seems in good spirits. I would bring her in the house but I'm afraid it would be too warm.
Does Lucy like shredded lettuce? you might try to entice her with some floating in her water, also some good poultry vitamins in her water till she is eating again will help to boost her immune system. Mine laso love whole corn I only give it as a treat and on really frigid days, but if you mix some into her reg feed she may decide to eat.