Top leaf issue

Gonna say check your run off ph if it is lock out you want to correct that immediately. Do not ignore it if is substrate ph.

Oh and there's potentially manganese deficiency or lockout, looking at that. But I'd still say, first, lay off nitro, more calcium and some citric acid.

Its not abnormal for plants to get their nuttrients out of the leaves in this stage of flowering. I think your nutrients in soil could be fine, just your PH to acidic. Test soil ph and adjust accordingly. But in a week or two they will be ready so I would ease off the nutrients in a week to let the plant flush and use its own nutrients.

Looks like you got too much nitro, not enough calmag (particularly calcium). Lay off whatever nitro stuff you're using. All of it, add some calcium, magnesium and I'd even say citric acid (to maybe make the plant utilize some other nutrients a bit better).

Hi mate, looks like calcium deficiency although its not something I would worry too much about this late into flower. Keep an eye on your PH and she will be fine. She is looking great. Good luck and happy growing