My girl said she's never cum from oral and she's not a clit person. My attempts at oral (though very inexperienced) have failed. But she says her favorite position is on top, and she comes from grinding against the pubic bone. Isn't that clitoral stimulation?

If a girl's favorite way to cum is on top and grinding against the pubic bone, shouldn't she be able to come from oral too then? What are your experiences?