[screaminggood]

I know a lot of people are going to respond that you shouldn't make a move because she's married...and you definitely should consider the potential pitfalls. If you two still feel like she's the one and you're both willing to risk it, then a simple, half-joking, half-serious question, "Ah, you say that now, but would you ever really do it?" might be a nonthreatening way to bring the topic to the forefront. She's then in control to choose how to answer your invitation but if she says no, you're not destroying the friendship.