If she is wild leave her alone. That male duck was not trying to strangle her, but mate with her. Many people freak out when they see how ducks mate at first and think the male is trying to strangle or drown the female. That is just how ducks mate. Most independent wildlife rehabbers won’t bother to help unless you write them a fat check. I called every name on the local government website. I finally found a rehabber to take in a wild bird that had a broken wing. When I first got there she took the bird from me very abruptly not saying a word. She then shoved a ledger in my hand to fill out for money. When I was about to write a check for $500 and started asking questions about where the money was exactly going. She said “vet bills.” Very shortly. I said “what vet do you use?” Because I lived in the area and knew which vets were around. She started to get very angry and said it was none of my business where the money went. Driving up to her house it was a hot mess and practically in shambles and yet I noticed a new car along with a nice boat in her driveway. I have not used an independent rehabber since.