The conversation usually goes something like this:
You: Babe, I'm going to hoop with the guys.
Her: Will Paul be going, too?
You: Well, we're going to his house.
Her: Aww! I haven't seen him in forever. I'm coming with you!
But wait, she hates basketball and ten minutes ago she told you she was so swamped with work. Something seems off.
Again, use your good sense. Her affection could be growing, or she could just enjoy his company and need a break from work.