Unable to during ?

My partner has been having for almost a year and she has never had an . As a guy I feel a little selfish, like she's missing out, maybe I'm not doing something right, etc. I've searched online and have tried everything I could find (not just , stimulating her first, vibrator, taking a long time, etc) She's never masturbated. I'll ask if something is better than something else, and she usually says it all is good (and a variety, not just one thing/move). Sometimes I think she's close, but she says she's never had it. She says she's ok with just waiting until it happens someday, if that's in 10-20 years. We're both in our mid-twenties now. Should I ask if she wants to see a doctor, or just forget about it? Has anyone else had this problem?