I am new to ducks, just got our first two this spring. Now our white layer, is acting weird and I have no idea what to do or what could be wrong. She was walking around this morning, then suddenly collapsed and couldn’t get up. She could move her legs but they didn’t hold her up. I gave her a dose of poultry drench vitamins, she stood right up and walked like nothing happened. Then this afternoon she was walking out in the front yard, and her legs just went weak again. She laid there for 5 minutes and then got up and walked away. I am so confused on what is going on. Thank you in advance for help!