I would suggest that if you had a falling out that you should write to her and try to have a reconciliation. None of us is perfect and as we get older hopefully we learn from our mistakes and learn to be more prudential in our responses.
I would also suggest that you try to live the holiness that God is calling you to live. It is primarily by the holiness of life that we can win others to the Faith and even if she can’t see you that holiness will have its effect. How she responds will depend on her. I recommend that you pray for her and leave her to the mercy of God who sees everything and knows everything.