people tend to overthink this whole broody breaking thing. It really doesn't have to be that complicated. There is one golden rule and as long as you follow that she will give up in normally about 3 days. I have once had a super determined silkie which took a week.
Here is he golden rule - keep them off the nest 24 hours a day. See not that hard ;-).
If you let her back at night it won't work
If you let her back on and off during the day and just keep taking her off it won't work.
No access at all 24 hours a day for at least 3 days or till she stops running back to the nest when you let her out.
The rest really doesn't matter that much, here is where my last broody spent her time out
No dunking, no cold air and no tiny cages. Just a few tomato stakes and some plastic wire at the end of their run. Worked just the same. She spent her days in there and about 4pm we locked the nest box and let her back in with everybody else to roost for the night.
Thank you so much
My only concern she is not eating (she is eating like a 20% of normal). Today I left all day in their cage and has been on its perch (is 10 :20 am here)