She talks about her marital problems with you
Does she talk about the issues she is currently facing in her marriage with you? When a married woman desires you, she will also start opening up about the cracks in her own marriage. She might talk about the issues she experienced in the past with her spouse, and might even start venting about him to you.
Probably the most obvious sign you need to look out for is when she draws a contrast between you and her spouse. This kind of contrast might be seen in phrases like: “I wish it was you.”, or “I wish he was as kind as you are.” At this point, I think it’s very clear that she would rather want you, over anyone else.