You could also be missing her developmental period. I know of someone who tried to breed a female multiple times with no luck. Once he started ultrasounding he realized she started developing way earlier than his breeding season started and absorbed the follicles before she was able to be bred. Once he realized her developmental time was so much earlier he started pairing her and gets viable clutches from her every year. I know it would be more trouble to go out and buy an ultrasound to figure out a normal but its definitely a possibility that you're just missing her time instead of her fitting into your time.
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