Telepathy and telekinesis are both psychic powers, right? It doesn't make sense that she would be stronger at one than the other.
She could be more skillful at one than the other, sure, but the raw power should be the same, since both powers are generated by the same DNA and the same mind.
The way I see it, the only limits Jean actually has are psychological ones. You see, I don't like teen Jean as a character, but I think she pretty much showed that.