Chasing the mourning dove around could have been more about territory than gender. I introduced a male diamond dove to my female and she attacked him immediately because it was "her" cage. I didn't expect it because I assumed males were the territorial ones but I was wrong. As for the mourning dove and your ringneck, they're different species so that might have heightened the likelihood of conflict. Mourning doves and ringnecks can create viable hybrids but I'd imagine you'd need a single male. As far as your ringneck pair is concerned, they're both in a closed relationship regardless of gender. If your friend insists it's a girl maybe it is, maybe she needs some time before she lays a few eggs. Maybe she's a rare specimen that won't lay eggs but is biologically female.
It's probably for the best that the mourning dove situation didn't pan out, it might have had some parasites (nothing serious I bet, but maybe stuff that could be a nuisance). If the mourning dove had been a tame female and your male ringneck was single it might have gone differently, who knows. Usually it's best to leave feral and wild birds alone unless they choose to join your flock. If a feral pigeon flew into your coop one day (if you had / have one) and was bonded to one of your birds, I'd say if you aren't too worried about the offspring's appearance and pedigree, to just let them be together. As for mourning doves or other free flying birds; you never know if you're taking one of a pair who has chicks back home. Doves and pigeons alternate sitting on eggs as I am sure you know so you might catch a husband or wife while they're taking an egg-sitting break and then the other parent and their chicks are screwed. I am not saying I am damning all those who have taken in / caught feral or wild birds. I am just saying that it's best to avoid it whenever possible.
Eric
It's probably for the best that the mourning dove situation didn't pan out, it might have had some parasites (nothing serious I bet, but maybe stuff that could be a nuisance). If the mourning dove had been a tame female and your male ringneck was single it might have gone differently, who knows. Usually it's best to leave feral and wild birds alone unless they choose to join your flock. If a feral pigeon flew into your coop one day (if you had / have one) and was bonded to one of your birds, I'd say if you aren't too worried about the offspring's appearance and pedigree, to just let them be together. As for mourning doves or other free flying birds; you never know if you're taking one of a pair who has chicks back home. Doves and pigeons alternate sitting on eggs as I am sure you know so you might catch a husband or wife while they're taking an egg-sitting break and then the other parent and their chicks are screwed. I am not saying I am damning all those who have taken in / caught feral or wild birds. I am just saying that it's best to avoid it whenever possible.
Eric