I'm going to agree here.
OP is acting like the drake is a vicious crazy duck killer. I highly doubt this. I also believe OP may be over reacting. Ducks are way different than chickens, OP.
You're the one asking for advice. We are just giving advice as many of us have had ducks for years. You don't have to listen, it's your duck. You do what you feel is best. The duck is obviously quacking at night for a reason. We're trying to help you figure out 'why'
What do you want us to tell...
Well, she's still technically 'by herself'
She should be with other ducks. Maybe she doesn't want to be with chickens. You said she is limping? Does she seem hurt? I don't know what to tell you.. maybe just put her with the drake and see how it goes? Or just deal with the quacking?
Is she a pekin? I have a 2 yr old female who quacks really loud at night, mainly when she 'hears' something. She has to scream really loud so her duck friends will come and scream with her.😒
She's just a silly duck who is always on the go.