FY, I agree that you're doing very well. I think it's safe to attempt a little physical contact--squeeze her shoulder or pat her back when you pass by her. Make eye contact, and offer honest, specific compliments.
How about GALing by doing something you haven't tried before, like a dance class? That'll get your W curious, and she might even want to join.
Just giving you some ideas. Don't let things be stagnant for too long.
