Experiment with different pressures, strokes and speeds. Ask her which ones she likes best. If she's willing, invite her to masturbate for you so you can learn exactly how she likes to be touched. Many women are shy to do this at first but with some gentle encouragement she may really show her wanton self. It can be a great turn-on for both of you.
Many men are actually quite frightened by a woman who is fully sexually awakened.
They may doubt their own ability as a man to keep up, or to be able to perform adequately. They may fear that if she is too much woman sexually for him, that she may go elsewhere and find what she wants. It may help you to overcome this fear if you remember that you are not responsible for giving your lady sexual satisfaction. She must do that for herself. But if this fear is very strong, you may seek counseling help to deal with it.