I noticed my 2.5 month old Welsh Harlequin duck was acting a bit off later this afternoon. She was fine this morning, but around 4 pm I noticed she wasn't interested in the worms I was trying to give her. Later on I noticed her poop was white and foamy. I gave her some peas, which she nibbled on, but really didn't gobble, which she usually does. She did eat one or 2 worms, but not much. I've been busy today, so I didn't have a chance to see how she was early this afternoon, or what her poop was like. She is drinking. Does anyone have any suggestions about what might be ailing her? Thanks!