Being that young I doubt deficiency. 7ph is high. 7.5 can cause lockout of many nutes. Vermisoil is a good base. Peat moss, coco and added nutrients. It's a strong base that self sustains for the first month or more with no needed nutrients. PH your water to a 5.5 to a 6.0. PPM should be in the 200 range. If your using RO add calcium and magnesium to a 400ppm range. Keep the soil moist. Water to achieve a 20% run off. Hydro soils can be a handful to keep in check. Get the PH under control and your going to have a beautiful young lady.