I don't really noticed anything wrong with her.
If your talking about the yellowing of the leaves, its normal for blooming because they use a fert with lower nitrogen (unless hydro nutes are different in nute levels)
It could be a few things or a combination of things. Over watering, ph out of range, too high of ppm are the most popular. How's the ph and what ppm you running? Are your ph and ppm meters fairly accurate?