Plants are sick

Your leaves are fine as in they stand so wouldn't say under or over watering maybe a nitrogen deficiency

There is no thing such an overwatering, plants grow in water (hydroponics).. There is only a lack of drainage and/or root bound conditions. Diagnosing flowering plants is super hard.. Ph could be a culprit.. Could be just her life cycle. Keep in mind at this phase she will be putting everything she's got into making flowers and she will start to slow down considerably in her need for nutrients, the need for water is still present as plants Transpire and transpiration is a huge part of plant biology.. So she will translocate from the foliage as well as from the growing medium. The last thing you wanna do is panic and over react.. Let your grow finish. Find your observations.. Changing things in a big way right now won't change anything.. it's too "late". a

I would think your ph is off in soil by cal mag spots, phosphorus deficiency, nitrogen deficiency signs even see zincI believe. Substrate ph is off. What is your run off ph? Use a calibrated ph pen.