You could set up a broody pen for her.
This is what I do.....
Is she on nest most the day and all night?
When you pull her out of nest and put her on the ground, does she flatten right back out into a fluffy screeching pancake?
Does she walk around making a low cluckcluckcluckcluckcluck(ticking bomb) sound on her way back to the nest?
If so, then she is probably broody and you'll have to decide how to manage it.
When I have a broody I wait until she's been in the nest most the day and all night for 2-3 days...along with those other signs I posted.
Then I put her in the broody enclosure with fake eggs in the floor nest, she won't like being moved, but if she is truly good and broody she will settle onto the new nest within a half a day.
Then I give her fresh fertile eggs and mark the calendar.
I like them separated by wire from the flock, it's just easier all around.
No having to mark eggs and remove any additions daily, no taking up a laying nest, no going back to the wrong nest after the daily constitutional.