Just keep pulling any egg she gets on. I have an Ee broody I think.
I've two marans on eggs, a Del and a C.Rock.
If I had more marans and Dels I'd not let them sit, but I need to bring their numbers up. I panicked when DW got sick and Now I need to replace the ones I sold.
So just pull her eggs and take her out of the nest box each time your out there.
I've never had effective broody breaking with the pull eggs toss hen method. They just run around a bit, then right back in. By putting them in the Eglu they are away from the main flock and can't free range, so they think about that instead and pace. I add the roo to keep her moving too. I'll leave her there at least a week.
Love my two Eglus, got both used for a fraction of the cost of a new one. Use them for transitioning chicks outside, broody hens (slightly different method used than breaking), grow out pen for bachelor boys and use the wire run in the coop to integrate pullets.