Could this be light burn?

Not light burn excess photons will cause it to wilt, get droopy, some interveinal paling will occur -- looks a bit different from interveinal chlorosis.. and then it quickly spreads at that point. entire leaf will turn white if you ignore it. false "albino" pics are made this way. tips curling down? likely nutes.. twisting new growth can be a couple things related to trace elements. best guess zinc, but... whatever it is, it's early. first, make sure pH is where you want it.. consider recent behaviour... feed alot? feed little? etc.. regardless, i'd go to water-only and ph'd for a couple irrigations. I bet it starts to improve.. if not, double check which nutes you have supply the trace elements and possibly up it. If it does improve, it was likely lockout or something else related toa bit too much buildup in soil.

What type of soil are you currently using? One with added nutes? If not i'd be giving her a 1/3 str feeding solution. How low did you have the light at? According to your grow your at about the perfect height now..Hope this helps..