Hello
@Kris Melody,
As Brother Chad has stated. "Prayer & Love".
That you are there as a friend even though you agree that "transgender" is wrong, provides an example for her that though Christianity/Church has not been a welcome place for her. It's more than words or buildings. It's about the message that has been given us, how we live it, and show it through the love that was given to us in Christ Jesus and this before we were ever forgiven.
If you have told her when asked that you don't approve of her lifestyle, yet still have continued to show her the Love of Christ. Your honesty, and unfailing love through Christ Jesus will go far in helping her see what she has so far not seen in the name of Christianity. She now defines Christianity through the sin she lives, and desires to continue to live. Which is the case with a whole lot of people. Even some who may call Him Lord.
You now have the opportunity to be the Christian she maybe has never seen before. The one who doesn't approve of what she does, but still loves her despite the sin/behavior she has chosen to live. The hope is that through your actions and words she will be shown the true meaning of the love of Christ Jesus. Which sadly has only been shown by little more than lip service, and the horrible incident experienced by her.
Just remember that this may not work at all. She may yet turn away. Many seek not salvation through Jesus Christ, but worldly acceptance of their behavior. Yet, these are choices that each of us must make.
Also, any change that occurs in her even if she is willing, will not happen by her or your own might and power. It will only begin through the power of the Holy Spirit and this only by her acceptance of Christ Jesus as her Lord and Savior. Anything else is a delusion.
You state that she gave Christianity a chance, but has she given Jesus Christ a chance?
Keep in mind Kris, that you don't go through this with your friend alone. The Holy Spirit is your ever present guide, helper, in all that you do. May you be the vessel by which the Holy Spirit accomplishes His work with your unnamed friend.
I have prayed for you both. In the name of Christ Jesus Kris. I truly pray for her salvation above all else. Amen.
YBIC
C4E
P.S. Have you been baptized yet? If not, maybe when you do. You might invite your friend along to see it. In fact invite your friend to see it!!! Your obedience to this and public acknowledgment of belief, has a tremendous affect on all who see it. Especially those who don't yet believe!