Should I keep going?

I will get right into it. My partner has never orgasmed before and I have been trying to get her to orgasm. She’s never masturbated and she does not want to so she doesn’t know what she likes. Sometimes when I am rubbing her vulva she starts moaning and tells me to keep doing that but after a while the feeling goes away she says. She says it feels like a feeling that needs to be scratched and it feels good but doesn’t bring her close. One time I noticed her clit would get really erect when that happens but then it goes away. What does this mean haha? Any girls here know what means? And is she getting close to orgasm?