Today my duck has been acting real lethargic. She isn't standing at all. When she walks, she stumbles and falls. She sleeps all day and when she lays down, she lays with her head on the ground. I'm not sure of her age but I have had her for two weeks and got her from the tractor supply store. When I gave her a bath today, she just sat in the water. When I took her out, she didn't dry her self like usual. She isn't eating or drinking water. Please tell me what is wrong with her.