Was she into me

Well I was sitting in the bus today, and a woman (mid 30s) sat beside me and her arm was touching mine on the arm rest. Now I want to point out that the ride was 10 minutes long before she got out of the bus and the whole time her arm was touching mine. She never moved it. I feel like the fact that she was comfortable being intimate with me might have been a sign and I regret not having made a move but I was nervous. Did I mess up?