I believe it is a genetic issue. You may not have noticed a small cross beak earlier, but as she ages, the beak crossing will become more pronounced. I have an EE with a cross beak. She is now a year old. Her top beak will curl down past the bottom beak, which is straight and off to one side. She cannot eat treats as well as her siblings, but she gets along ok with her pellets. She likes a deep bowl for her pellets, and pecks a lot more than the others to get the same amount of food. But she is good weight (bigger than her EE sister) and lays a pretty blue-green egg 3-4 times a week. I have trimmed her upper beak twice with toenail clippers, and she has worn or broken it off twice. I have cinder blocks in the run that I think she uses to help file it down. If there comes a time when her weight drops and she cannot eat well on her own, I'll know it is time to cull, but as long as she seems to be healthy, we'll just monitor her condition. Good luck with your little chick!