I had 2 Wynadottes go broody, thankfully not at the same time. The wire cage was strongly recommended but I thought it "mean". 1st - I removed her whenever I saw her in the nest, alot of back & forth. 2nd - I block off the nest box AFTER everyone laid, I only had 5, they all lay mid morning to early afternoon. The first Broody was getting "light", I ordered the wire cage.
I wish I would have done it earlier

I was able to suspend the cage balancing on a roost board, so she was able to stay in the enclosure. Put food & water for her, no bedding, just wire flooring (I put a piece of welded wire 1/2 x 1). The first Broody was 3wks into brooding & she was stubborn, took 4 days before she finally was "normal".
My second Broody went straight into the cage when she started, it took 1 day.
So the sooner you start, the faster they "break".
Either that or stick some (4 - 6) fertile eggs under her to hatch, get some "backyard" mix in the event she gives up. Or I've also read some try sticking baby chicks under the Broody but depending on your girl, you may need to raise the chicks. You put the eggs/chicks under the Broody at night when it's dark.
Other may have more ideas....Good luck