Start by using 1/2 the strength of nutes you are using now, It looks a little dis-colored, It seem like the veins are a darker green than the rest of the leaf. It could also be "light bleaching or an Mg def. Are you using any kind of CalMag or Calcium/Magnesium enhancer. If you are using RO water Mg can become an issue. How far is your lifght from the plant, and what kind of light are you using? CFL, HID? Try 1 drop of "Superthrive"/2 Gal of water. Superthrive has always brought my ladies back. Just remember, she is a baby, so starting off with 1/4 to 1/2 strength is always best.

Good luck and keep us posted!