Yes, bless you for rescuing her! My Duclairs - just the white ones from metzer - are my friendliest ducks. All my ducks are sweet, but these girls let me love on them and they are so nice to the two little call ducks I recently adopted. My first Duclair came with a couple of runners, and I started to see in my flock that the similar ducks often paired up, so I ordered another Duclair the next spring and they became best friends quickly. Every time I integrate ducklings my grown ducks are terrified of them. It just takes time for everyone to get used to each other. You'll get there, and it's so sweet of you to provide a loving family for this duck!
On the note of duck dumping, if it's a regular problem in your area maybe you can start a public awareness campaign! You could start by visiting the stores the ducklings are sold at and letting them know it's a problem in your area. Perhaps they will change their policy about selling ducklings around Easter. I wrote a document for people considering ducks, due to the duck-dumping problem, and asked my local granges and tractor supply if they wanted to use it to hand out to customers considering ducks. I only heard back from Tractor Supply, and they requested it and said they might use it next year! Some people are just terrible and selfish and some people just don't know that domestic ducks shouldn't be left at ponds and lakes. My family did this a couple times when I was a kid and I am horrified now to think about it - like I lay in bed sometimes and feel awful thinking of how the ducks must have felt. We loved the ducks but I think my parents just didn't know any better. Sad! Anyway, I try to make up for it now!!