Your problem is a common problem for beginners... you swapped to your bloom nootz to early. What’s happening is called Die Back , it happens during/or/by the end of the stretch where she use a lot of Nitrogen to get twice big in just 3 weeks .... she’s sacrificing the bottom to save the top by moving her Nitrogen.....
Unfortunately, adding Nitrogen is too late now, the roots won’t process it as they are concentrated on processing P and K at this stage ...
My best advice for a beginner would be to not plug off any leaves if it isn’t totally dead and crispy and ready to fall... Or 1ml / l of a 100% organic 9-0-0 in a spray bottle with water @pH 7.0 to make a foliar feed before those flowers gets bigger !
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