My husband and I are not of the same faith anymore and thus considered unequally yoked by some circles.. He is Catholic and I am Baptist.
It is not easy .When I first married my husband because I thought I could change him and because I thought I would never meet anyone else who "valued" me.
That was a mistake we nearly divorced twice but God gave us two special needs kids an reminded each of us how much they and God needed us.
It isn't easy and there has been a lot of heartache in the 18 yrs we have known each other.
I am the spiritual leader in the home and I absolutely hate it......My husband became a Christian when he was 17 after a Billy Graham crusade but fell deep into an addiction that has also helped nearly destroy our marriage I am not saying that your girl friend is anything like my husband just cautioning you about getting involved with someone who is not on the same spiritual wave length.
if your girl friend is not a Christian or is drifting my advice is to encourage her with scripture and prayer if there is no change in her behavior or attitude towards God, Christianity let her go. It may seem easy for me to say this but I live with a man who in many ways himself is running from God and it's hard to stay a strong Christian when I am being dragged down because of my desire to serve God deeper,