Lack of Clitoral sensitivity

[Faraway]

Hello, I was wondering my fiance says that when i go down on her she doesnt really feel to much, now in the past i have been down on her for over 45 minutes and i have tried everything from being very gentle with it to moving quickly but she says that only on one occasion that she it really felt great, and she doesnt really remember what i did. Now we are in an interesting situation we are both in the military and about 8000 miles away and will not be together for more about another month and have been apart for about 4 and a half months now. I have talked to her about it and i asked her to try to manually stimulate herself but she just does not feel comfortable doing it. One time she was doing it for about 5 10 minutes to herself and she said she didnt feel anything, now she was doing this on the webcam which she said she is not entirely comfortable doing, so i think that it could have been a mental thing. I asked her about when we have sex what she thinks about and she says that she mainly thinks about making sure that i am enjoying it, now being a male i always enjoy it no matter what, when we have sex it normally lasts about 30 to 45 minutes so i dont think its the amount of time and im not huge myself but im bigger than average and she has never had sex with anyone else. Is there a possiblility that she just has less nerves in her clitoris than most women or something, or could it possibly be a psychological thing. I want her to feel the same pleasure that i do when we have sex and give her an orgasm. She also thinks that there is something wrong with her and it is emotionally effecting her. It makes it difficult to do anything about it while we are both so far away, i just was looking for some advice.

Thanks