As a Mom, I was in charge of the OOT bags - buying everything (after getting Mandy's final approval), packing and hauling the stuff and then completing the bags when we arrived in Mexico. It was really fun for me to do, I enjoyed it, and it was one less thing Mandy had to stress about. I also made really nice welcome books to add to the bags: http://bestdestinationwedding.com/forum/t22106
Also, another way to get your mom involved is to have her sign up for BDW. Mandy recommended BDW to me, and we both have loved being on the forum together. Plus, I found so many great ideas on here for the OOT bags, books, fans, etc., and Mandy and I are always talking about forum stuff even now after the wedding. There are quite a few moms on the forum, so she might really enjoy all the wedding talk.