Hello Jessica
What makes you feel she isn't born again? It is so easy to look at others but not see their heart, a tree will always be revealed by its fruits.
What you are experiencing is very common, many of us go through this, it is because we loved them so much. I had this issue with my wife, it is always a loved one and the devil knows this.
The simple answer is accept her as she is, love her at all times, pray in faith for her salvation, pray for her to hunger and thirst for the truth in The Word. Always pray in Jesus Name. Does you friend pray to God in Jesus Name?
Lift her in prayer to our Father, in love, in prayer for her salvation, leave your prayers with Jesus they will be interceded for you, leave it to the Power of God and the Holy Spirit. God loves prayers for salvation, He sees the true warmth in our hearts, he answers fervent believing prayer, just 'Trust in the Lord and lean not on your own understanding'. Love your friend and watch the Spirit work in her heart.
We come together in prayer, in agreement, in Jesus Name. Amen.
Peace be with you.