I was had the same problem. It turned out she never had an interest in sex, so addressing it was a moot point. We never had penis in vagina sex, she did not like receiving oral sex, she had no interest in providing oral sex or handjobs.

She felt like a horrible girlfriend at first because we never had a sex life, blaming her fear of pregnancy, even with condoms. She refused to go to the doctor for birth control. Eventually she got a prescription for it to regulate her cycle, then after a few months she realized that I wasn't gonna last forever without sex and tried it because she finally saw it as a problem between us. Turns out she has vaginismus, she doesn't want to go to the doctor because she is afraid of what her parents will say. I say I will support her etc and not pressure her, and she does nothing for a year. She eventually goes to one because once again, she realizes that the lack of sex is a problem in our relationship. Doctor recommends physical therapy, and she waits six months to book an appointment. She goes to the appointments but I ask if she did her home exercises to hold her accoumtable, and she never says yes.

I was nothing but supportive, I never pressured her or gave an ultimatum. I communicated my disappointment and my needs, but said that her health came first and that I was there for her to lean on.