Ok, so in my culture (Armenian), we have a tradition where the groom picks his best man and his sig other becomes the MOH (as long as they are in a serious relationship and she's not just the flavor of the month). I am totally ok with this, because I know our best man's fiance and she's pretty alright. However, the problem is that she has been totally non-existent through the whole wedding planning process! She has not been involved, she has not helped out at all, and I feel like I'm always the one initiating her involvement. What's more, they just got engaged recently, and I feel as though they are too caught up with that to even care about ours. Not to add that my other bridesmaids haven't really done anything.
How should I tell the MOH especially to get her act together and help, but being nice about it? They have asked us to be their best man and MOH also.