How to make a girl blush?

Ok, I talked with my crush girl. We talked about programming, what do you like in programming, how was your day etc. I didn't found anything awkward. I want to be friends with her and after that make a move on her. But she gets very very shy. She gets red in the face. She starts to sweat when she talks with me. I talked with my friend about this. He said that she's clearly in love with you, but you talked with her like she's your friend. How can I make her blush even more? What should I talk about and what should I do?