Hmm was your girlfriend sexually abused or had an otherwise rough upbringing?
I ask because, my fiancé has only ever made me come a couple times, he's the only man that has ever made me ***.. And we have been together for 11 years!
I was emotionally, physically and sexually abused as a child.. I think it has something to do with it.. I will come really close, then my mind goes haywire and I just can't..
Just lick around her clit slow and then fast. Suck on it not to hard. Just imagin your french kissing her but just on her other lady lips. any girl will climax trust me.. :)
I would say focus more on the clitoris, its the most sensitive part of a woman's body.. she should have an orgasm after that, trust me!
The same goes for me. My gf says she loves it, but usually has orgasms through 69. You might want to try 69, finger her while you lick, or concentrate your licking on the clitoris. Best of luck.