Thank you for the reply. I do believe she is sick in some way because she remains on the porch and I have left food and water for her and she does try to eat and drink but coughs a lot while she is trying to get it down. She has tried to return to the water and the other swan runs her away. We live in Oklahoma so I will try to find a waterfowl vet and see if we can get her some treatment. I noticed today her neck seems to be smaller like she's lost weight in her neck (or that's where it's most noticeable). Will keep you updated. Thanks again.