No, no they can't...
http://www.messybeast.com/cabbit3.htm
It's not really going to argue about this, the proof will be in the pudding ( infertile eggs). I do not want you to get false hopes. This is an excellent chance for you to get fertile eggs and rebuild your flock.
I do not believe that chickens and ducks can crossbreed. You could still try letting her set and stick ducklings under her later or obtain a few fertile eggs to switch out.