Is the plant fading at all? How do the trichs look? The trichs (not on the leaves) should go from clear to cloudy. If the soil is still feeding it (especially N) it will continue to grow.
Just stop fertilizing. I would only do flushing with hydroponics if I had been going heavy on the feed. I always back off N right before flower, and taper it down to just P. The last couple weeks I give just plain pH’d water. I live in a legal state so I can experiment a bit after my jars are full. The 3 plants I have hanging now went to almost 90 days. It’s really strain dependent.
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