My girl has small orgasms is that normal?

I have been with different women and they all seem to have different ways of reacting to an orgasm. However, my new girl has many small ones. I am talking about between 6-10 in a two hour time frame. Small being that I can feel her muscles pulsing on the inside but she does not squirm or tense up like my exes. I have tried clitoral stimulation, foreplay, g-spot and combinations of all. Is this normal or am I missing something?