So I just got back my RSVP from a friend and instead of putting down her name and her husband's name, she wrote that she was bringing her mom... I know her mom, it's not like I've never met her but I also didn't invite her. I invited my friend and her husband. I get her not wanting to come by herself (she's pregnant and pretty far along) but a heads up or a quick "hey is it ok" text would have been nice. Rude or nah?