Moving a broody bantam

I have a broody bantam and decided to get her some eggs to sit on.  Hubby spent the weekend making aher a lovely box of her own to sit in rather than the nesting box that they all use.  How on earth do I get her interested in it though!  I have tried adding an egg but she would rather sit on nothing in the nesting box than move to the nice new house.  Should I just segregate her so the only option is the new house and hope she doesn't stop being broody?  Luckily I haven't got any eggs yet as thought I should get her happy and settled in there before adding them.

Thank you, can i ask how big your broody coop is?  I'm wondering if ours is too small, we made it about as big as the nesting box which they all use, there is about enough room for two hens to make a nest each and I was going to section off part of their large run. 

She's in there  Hasn't shifted all day.  Should be gtting my fertilized eggs tomorrow, do I just slide them under her wearing a heavy duty sleeve?!  I'm hoping the box id big enought but seeing her in there I think it will be.  Hubby is worried about the cold weather coming at the weekend and will probably be out there with a blanket    Am I ok leaving her in the general run for now and just segreagating her an area off once the chicks are hatched?  I wouldn't need to move her to do this, just put up some small guage wire.  Exciting times!

My broody coops (last year used my eglu) has a run attached (which I only use after the eggs have hatched) so whenever I let the broody out with the others I shut the run up so no other hens can lay in there.