If you continue to say and or do, you may find that she will become more frustrated and that can hold her back. She needs to learn that she shouldn't worry about pleasing you and your expectations of her and start concentrating on what she is experiencing and feeling. Again, I would get her a bullet and let her experiment with the sensations alone without you hovering over her. She needs to learn about her body with out being pressured by you... believe me - if she is more relaxed and understands how her body works it will be good for the both of you in the end.

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A blessed thing it is for any man or woman to have a friend, one human soul whom we can trust utterly, who knows the best and worst of us, and who loves us in spite of all our faults.