Leaves turning brown drying out.

You really do have a problem here - and right off the bat, I would start thinking about a fungus - but it may also be a nute issue.... The problem is you don't have a diary so we have no information, all we have is one photo, and that's just not enough to really be able to help you. I would do some investigation of fungus, leaning more toward rust fungus (if you rub your finger over the spots, does it come off on your finger?) ... and you might want to read this article: https://www.urbanorganicyield.com/rust-spots-on-leaves-during-flowering/ If it doesn't come off on your finger, you've got a nute problem .... and you'll have to figure that one out yourself unless you want to start a diary and put as much information as you can into it... and once that's done, come back and ask your question again (the comment section here is not really an effective "chat" - even if you tag someone, they won't know you've responded to them unless they check back frequently).... From what I can see, whatever the problem is it's pretty advanced so the sooner you can diagnose, the better your chances of saving what you can. Good luck!

looks like your ph worth is not the best do you have a tester ? first check ph and give her just water for 2 days.

Heat stress?