-_- Point is if Sakura really wanted to be trained then she would and, she could train herself, there are many other characters that you see training themselves, mostly the ones training with the teachers are leaning new techniques, or at least most of the time, but you see Hinata training by herself, also Rock Lee, Sasuke, Naruto etc. -_- the easiest thing a person could do is train themselves, all they have to do is rather do chakra focus training, punch or throw shuriken at logs...point is she dosen't