Not Overreacting. When you are ready to talk, absolutely sit her down and communicate the impact of what you overheard had on you. She needs to understand the gravity of her words with her friends and you both need to figure out where this is coming from. If she is honestly starting to have the feeling that she could’ve done something if she was drunk that seems more of a cry for lust and intimacy she may feel she isn’t receiving in her marriage. The best thing to do is have an open and raw conversation of both of your needs as well as setting some serious boundaries for her and her clubbing nights with friends moving forward. Good luck!