I would try to talk to her about it. JUst like bunchobrides said. I think that would be the best way. My moh is also planning her wedding and I'm her moh. So we're having lots of fun doing this together. So maybe you could do it that way. Say hey why don't we do this together. We tried doing her's one day and mine another day but with 4 kids between us it was hard, so we decided hey on the days we're together it'll be both weddings. I mean you can always replace her or ask her if theres a way you's can do this together that'll make it less stressful for both of you.