Maybe PH Lockout?

What media you're using? coco? then pH of 7 would be very, very bad. it should have been around 5.8 If it's soil it's still a bit acidic. The plant is not looking healthy at all. As far as i could tell, it started even before you send them into flower (good that you have shown this in your dairy). She looks fried to me, which usually means really high concentration of fertilizer (could also be something else, just my opinion) what i would do: Check if the pH is correct for the medium you are growing in. Check if the E.C. is correct for the Medium and the state of your current plant. Check if you water correctly. If you use synthetic nutrients on coco, you need to drain about 20% of the water you're giving, so the salts don't accumulate in the coco fibers. you can find all that information in the internet, on youtube etc. good luck with your grow!