Hi Patrick,
Girls are a little different to Blokes when it comes to achieving orgasm.
She can 'massage' her clitorous, this is the most common form of female orgasm. It can be massaged by hand by using a vibrator.
Or she can attempt to achieve an orgasm through penetration of the vagina. Again, this can be by hand or by using a sex toy...
She may not be achieving orgasm because she feels like she is going to pee and stop, it is pushing through this at which point you achieve orgasm...