First break her from being broody. Get her back to normal. Then you can work on where she lays.
When I built my nests I made a couple of them so I can lock a chicken in them if I want to. That has come in handy in several different ways, This is one.
When I have a hen that is laying...
Then you need to break her. Lock her in an elevated crate as I mentioned.
Probably but you don't get guarantees on any chicken behaviors. Going broody is hormonal, some hens never go broody. Some hens rarely go broody, maybe once a year at most. Some go broody several times a year. You can...
Some things don't sound right. A broody hen should not be laying eggs. Are you sure she is the one laying those eggs? Sometimes another hen will lay with a broody or a broody will move an egg to her nest. If she is truly broody and laying eggs that is not right. But you say she wants to...