That was very sweet of you. I'd say Poppy and your hen would probably be fine together as long as there is enough room for them to get away from each other if they want. Maybe once you get them set up together you can snap a few pics and share with us?
Is the chicken rooster or hen? Where did you get Poppy?asking because a female Pekin would more than Likely be larger than a Mallard I am wondering if she is a White Mallard
Is Poppy same size as the Mallards? sounds to me like she wants her freedom and if you haven't a way to keep her contained [maybe if she had another duck friends] she will just keep going where the fun is with other ducks.
What would happen if she came back and you put her with who?
If she isn’t fenced in where she would be safe I don’t think I’d clip her wings. She is a Pekin and she flies? That’s a new one don’t hear about many Pekins flying.
She doesn’t have a house to sleep in at night that is how I pick mine up to clip wings I walk them into their house .I am not sure but I don’t belive that’s a drake feather if it is it’s not fully one yet.