i would give her another week of flush, after that you can chop, r put in to darkness, if you can check your trichomes as that is the best way to see if the plant should be harvested, i looked at the fast buds, for that strain and they suggest a flower time of 30-35 days, most strains flower for 7-8 weeks, so if you let it go another week, you should have a better yield as well as a stronger smoke, either way with all the flushing you have done she will be ready when you are, as far as doing the dark it does not really do much except the darkness helps ripen the buds faster, so to make it easy, chop and hang when you are ready, good job on the grow