Congratulations and Welcome... ducklings need to be watched when around drakes some can be pretty nasty to them. Once the ducklings are around 2-3 weeks old they can get away better. Sometime mamas don't protect like they should either. I always keep my moms and ducklings in veiw of everyone but...
Aww she is so adorable. Bless her heart she doesn't look very happy. so did you ever find out what was going on when she was sick? I guess I missed that post somewhere.
I'd say sad puppy dog face.
Not sure what it is but if it's for treating wounds and infection I'd try it as soon as possible, looks like someone may have tried to eat the yolk sac.
do you have some Vertricyn spray or betadine? you need to clean that up, is it the yolk sac? looks awfully bloody but main concern now is infection. Sure hope it makes it.. if you have to use betadine mix it with warm water to look like weak tea.