Maxx this has worked for me time and time again. Put her in a WIRE bottom cage. Small and unconfortable. You want her in bright light (without chilling her). keep her in until she lays an egg. Mine go crazy in the cage. The pace pack and forth and I get an egg in about a week. So, if a week goes bye and no egg,let her out. If she goes back in the nest, another week. Shell probably go out and be broken. This method works with my cochins in as little as three days, and it should work for you.
Good Luck.
Dont be worried about pacing, ifyou are just let her out and see what she does, if she stays off for a while youll be good, if not back in the crate!