Back off
Lots of women never orgasm from the old in-out. For guys, that's a hard fact of life. Is it a problem for her? Maybe not. I know a woman who likes being sexual, likes receiving oral, etc., but penetration doesn't give her pleasure. I really don't think she is all that unusual.
Your girl needs to masturbate to find out what gets her off. Then she can repeat it with you. Not to beat a dead horse, but your best strategy is to back off. Let her find herself and you stay out of the way.
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Ceterum censeo Carthaginem esse delendam.
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