"Should this be divulged to her husband?" - No. Nothing ended up happening and all it would do is throw their marriage into a state of mistrust and hurt feelings, most likely. People sometimes do stupid things, especially when booze is involved. Alcohol doesn't excuse bad behavior, but it's more 'wrong' to cause her spouse pain and mistrust, over a stupid judgement call of hers, than for her to keep her trap shut and contemplate how close she came to doing something that might have caused her marriage to end. (the same would be true if the situation were reversed)
If her behavior was habitual and she was repeatedly making out with other guys, then hubby should be made aware so they can consider whether they need to repair or end their marriage. One stupid, drunken, make-out session should be something her girlfriends talk to her about (the need for her to control her drinking and the need for her to consider her spouse when she's apart from him or just leave him if she's not happy in her marriage, because although her friends love her, they aren't okay with any of the group cheating on their partner).