It seems like i have a nitrogen burn on my plant a...

Thanks for good help and solid answers! I Flushed her 3-4 days ago with plain water because of nute lockout, she perked up with her sisters, but then she started wilting again yesterday, and she was the one who dried up the most. I have used PH 6.5 in all waterings, as it was recommended with this gene, i flushed her again now with 10L ph 6.5 mixed with some nutes, 0.5ml/l plagron grow, 1,4ml/l plagron bloom, 1ml/l sensi calmag and 0,5ml/l plagron green sensation 4. ( Did the flush before your comments so did not get to try out with lower Ph this time). Il dim the lights, tough she is in the lowest ppfd spot and all the other 3 are not reacting, think she is stressed out from lights because she is struggling with something else or can it be that some are more sensitive to light?

And Yess i think she is stressed from the lights too , the yellow tips means heat stress, they are a little bleached.

I'm not seeing any information on what nutes you're giving her and how much of them.... but I'm going to guess that you've still got some grow nutes going if you think she's got nitrogen toxicity again... During flower, they just don't need the amount of nitrogen that's contained in the grow nutes and, since she's reacting badly, I'd cut them out altogether (and yes, flush again). This time, try to get the PH to 6.3 or even 6.0 because you're going to want them to be able to pick up the calcium and magnesium and lots of beneficial micronutrients that are only available to the plant at the lower PH. Good Luck!