Non-stop broodiness

My Speckledie has been broody twice before for about 5 weeks but came out of it and laid for 5 weeks or so before brooding again. I accepted this behaviour as normal broodiness.
I just shut her out of the nest box after the others had laid and she was happy free-ranging with the flock for the rest of the day and I blocked off the nestbox at night. I haven't got a cage and the water dunking/ice packs etc didn't work.
This time she has continued to be broody for 11 weeks so far!!! She is healthy in herself, eating/drinking and flying/running about the garden, so no muscle problems. But she still has all the broody signs and when the nestbox is open she's in there, rolling the eggs into her nest and not budging unless lifted. I remove the eggs as soon as possible.
What has caused this extended brood and will she ever come out of it?
Should I just accept it and be prepared to never get another egg from her? I don't want chicks!!!!
Bit of a waste really, but she's such a character!!!

I have a silkie that lays for 3 weeks then goes broody for 7 or 8 weeks. I tried everything and the only thing that worked was putting her in a dog carrier with a mesh bottom which I had to make myself and put into the carrier. 2 days is all it usually takes to beak the broodiness with her now. It might be worth you investing in one, I use mine on all the girls now so it gets plenty of use!

I am having the same problem with one of my Pekin's.
 When you put them in a dog crate do you lift it up off the floor? Say on some bricks or just let it rest on the floor but with no tray in the base, just the wire mesh?
Thanks

Thanks. I'm going to have to give it a try because mine is just being very persistant.
Hope it works!