I’m not sure her sexual orientation should be a disqualification from joining the church. Homosexuality is a sinful act, this is true. But lets think for a bit about how Christ treated sinners, he sought them out didn’t he? Just because gay people make us feel more uncomfortable, it doesn’t mean they make God madder, that Jesus is making an exception in the case of “gay” people, “oh yeah, those ones can’t enter my Church”.
If they’re Gay, then that will be something they’re going to have to work out with your parish priest. If they’re Gay and managing to live a richeous life, then well… they’re a saint in my eyes, and I have to think God will have a reward for them in the Kingdom equal to the cross they carry in life. I would continue to guide her, and exhort her to a prayerful, holy life style. Gay or straight.