Cockatiel not staying in the nest box
I have a pair of cockatiels who have been mating for a while, sometimes 4+ times a day, but no eggs. I’m not sure what’s wrong. I gave them a nesting box and Disco (mom) won’t go inside for very long. She only goes inside if I’m interacting with the box, but never on her own. She has never had a clutch before as she is only 3. I’ve tried to give her fake eggs to show her you’re supposed to lay those and sit on them, she’ll push them under her, but won’t sit on them, even if they are in the nest box. The weird thing is, every time she comes out of the nest box, she wants to mate again, sometimes the male won’t, I’m not sure if this has anything to do with it. I’m just lost and not sure what to do. I have never bred cockatiels before or any type of bird. Is this something I should take her to the vet for? Please help.