Sudden degradation at end of plant's life

Hi all,

Plant had been flowering beautifully for many weeks...and a couple of days ago I saw that the fan leaves colour changing, which I thought had to do with lack of nutes. So I bumped her up on nutes but now the fan leaves all look horrendous.

I'm wondering whether there are strains where when they're "ready", they kind of just start dying? I ask this because this was a clone and the previous batch did the exact same thing.

Those fan leaves are pretty much goners. I'm wondering whether to kill the plant now before it gets worse or just let it take its course

That plant has quite a ways to go to finish and no - that doesn't appear normal. Give plain water a few times. Ride it out. I never recommend flushing unless it's coco.