Afterward, you feel happy. Then you feel guilty for feeling happy, then happy again. You've won the game. You didn't know you were playing, but you've won the game just the same.
I feel like she is sad in this passage. She gets this gut feeling that something is wrong when she gets this phone call. However, she feels relieved but at the same time she also feels guilty. I think her guilt could be that she wants to have Val back in her life but not as a friend, as a partner because we know she is in a abusive relationship and she wants someone to truly love her for her. But she is too scared to open up because she doesn't want to get hurt again.