This is a photoperiod, not a autoflower. You need to change your light cycle to 12 hours of light and 12 hours of dark to initiate flowering. It will not start flowering under 21 hours or light.
Hey buddy. Well cause she's a female and not an auto. The harvest window is really down to whenever u switch her on to a 12/12 light and it should say when you click on the strain how long she takes during flowering. Most fems are between 55-70 days once stigma has started. I'd recommend you do the flip now and she should start show ing stigma within a wk and then you count down from there and use the breeders flowering time as a guide but they are usually right and it's within that window. Good luck bro.
Just checked for you. So it'll be done anywhere from 49-56 days once stigma, (white pistils/hairs) appear. Hope this helps.