There is nothing you can do to reverse this. It sounds like a congenital thing. An Avian Specialist can remove her ovary (very risky surgery, and very expensive) and that will stop all egg laying. There are hormones you can give her (I *think* it's called Lupin or something like that? I might be totally off), but it's really expensive and requires daily use. If I remember correctly this hormone will keep her in a permanent molt. Ususally the oviduct is removed also with this strategy. Sorry for your situation. Best of luck and I hope it ends happily.