Depends completely on the type of girl she is for how she gets herself off. I had an ex that was the same way, however I found a position to make her cum. She needed CONSTANT, and I mean, never stopping, pressure on her clit - but at the same time needed a pounding. The grinding on the stroke wasn't enough for her clit.
So, the position that ended up working, was her tilting a bit to left, and me getting in behind her, almost like doggy, but then lifting her leg, and putting 1 of my legs between her legs. That leg was used for the grind while I hit her from the back. Kinda hard to explain, but it worked. And when in doubt:
