Geez I learn something new everyday on this forum.....
Try a vibrator/clitoral stimulator. Try on the floor at the edge of the bed so she can rest on the bed and not hold all your weight on one hand, while she uses the vibrator and you penetrate from behind. I agree with Rockrose, in that if there isn't much clitoral stimulation (to get the orgasm started, at least) then climaxing doggy style probably won't work. Just a suggestion.
noweapon, the answer is no. I don't think there is any chance she will orgasm with just doggy style sex - because her clitoris is between her vagina and her belly button. She needs stimulatin in FRONT of her vagina to climax, and doggy style doesn't reach that area at all.
You can do both - some doggy style, then switch to being on top, and that might work, or use a vibrator during sex, and that would work.
i think because we are so different and individual in regards to our bodies and sex, you need to ask HER this question and not us. what works for her may not work for me and visa versa.
I think it depends on the person. I only get one oral sex. Im very stubin of getting one I guess. Keep trying to give her one maybe that is not postion she can't get one Does that make sense to you?