Isbars are not supposed to go broody. They were bred to be a production breed, so those with a tendency to go broody would be removed from the breeding population. With that said, if you want to give her a try, I would only give her eggs that are not important to you as she may not stick with them for the whole 21 days. If you want to break her, just keep removing the eggs from the nest and putting her back outside. If she is not real serious about it, she will probably give up after a few days.
Thank you!! Really good information
I have to admit I'm a little relived by this news. I have a bunch of 4 week-olds in the brooder right now... Ready for a break from little ones!
I had a broody way back when who was really tough, glad to know this won't be the same