I usually water when they get a little droopy. But that's in soil. IMO she looks OK. When did you last water her? I noticed that your girl is an out door plant. Do you get much rain in your area?
Hope I helped out. If I didn't, don't worry this forum is stocked with information (and good people) to get you on the right track. Even if I don't have one yet, you should start a journal, you'll get heaps of help from more experienced growers.
Have you flipped yet? When did you last water and or feed your plant? What's you pH, what nutes are you using. Am asking all of this because it'll rule out a fee things. But from the looks of you plant under that light, it looks fine. I usually flush when my plants exhibit too many problems.