The reason I won't give her any eggs is because the last time, I did, and she was a terrible mom. First of all, she'd leave the eggs for over an hour every day. I got concerned and put some in the incubator as "insurance." Then at lockdown time, I put the incubator eggs under her. Guess what, only the ones that were in the incubator hatched. Then after they hatched, she'd leave them screaming while goofing around for an hour or more somewhere else. There was two, and one day they disappeared. I think it was a cat that took advantage of her inattention. She's an awful mom, so even being that determined, she's not getting any eggs.
Anyway, I had two broody at the same time, and the other is a GREAT mom. She got a couple of chicks since I didn't have any fertile eggs and now the little family is doing well. So yeah, I could restrict her so she can't leave the eggs, etc. for so long or whatever but I don't have a place for two moms at the same time anyhow.