They go when they want. Just because she is 1500 and you are ready doesn't mean she is. Last year we had over 15 girls that didn't go that should have and this year we already have 5 clutches and expecting 4 more soon. Some girls lay every year some won't. I have all my snakes in the exact same conditions yet some will lay in Jan-Feb and others as late as October-November. If you are doing everything correctly all you can do is be patient. There is a lot of waiting in this game I have a 3000 + pastel(my prettiest one) that I am still waiting 4 years on