Y'know, it's more than technique. Because I can give the same supposedly high-quality BJ to two different guys and get two completely different results--taker 1 won't shoot his load and taker 2 will. Identical BJs, different recipients. Some people just have the need for more sensation than a BJ provides, or longer duration, or whatever. Some guys have a mental block up thinking that because they've NEVER come from oral they NEVER will--that's crap, I've proven a couple of dudes wrong on that score.
Eliminate mental obstacles and let her improve her technique. Go a week without masturbating. See which options work and which do not. Perhaps you think because you haven't come with her you won't or can't come. Orgasms are tricky business; they do not like mental opposition of ANY kind.
So once you eliminate those barriers and really give her a chance...you should be fine.