Thanks for the question and it is very nice to read what you wrote and notice God´s love through you reflected in a concern for your co worker. I would like to share two points with you.
1- God is the one that makes us grow:" I planted the seed, Apollos watered it, but God has been making it grow. So neither the one who plants nor the one who waters is anything, but only God, who makes things grow" 1 Corinthians 3:6-7. I think that if your friend has heard of God, and If you can share with her some passages, videos, songs etc. God will talk to her. As humans we are limited but sometimes God wants us to pray so that other people can listen to his calls.
2-It´s true that God makes things grow. But he also likes to envolve us in what he is doing. If this concerns are in your heart I think you can pray so that the holy spirit can guide you when you talk with her. I think you could use some deep questions like:
What do you think is your purpose in live?
Do you think God has a specific task for you on earth?
Do you think God can talk directly to us? Have you experienced this?
I think questions are a good way to get people to start thinking beyond a belief they claim. If we believe in God, I our lives should demonstrate that.
So, I hope this can help!