what was the pH fluctuation and for how long? in soil the ph is a bit more forgiven, not as strict as hydro or coco (!!) how are the values now?
The plant is in advanced stage of flowering, just make sure the ph is in good ranges now and the EC is not too high and she will be fine. As I can see from the pics has another ~2 weeks to go anyways. One with nutrients and one without. Plants in the end part of flowering will turn all sorts of colors.
what's your next project?