I met a wedding planner who works at the Waldorf Astoria. She gives the mother of the bride a glass of champagne and 15 minutes to calm down. If that doesn't work, she gives them a valium.
Carnation, my mother is going through the same thing as you. My sister is getting married on Saturday so she is a little nervous to put it mildly. She and my sister went over the final guest list and made a seating chart. They have their dresses and shoes and have scheduled appointments for hair and makeup. Wednesday is the rehearsal dinner. It will be like Meet the Fockers, lol.
My advice to you is just enjoy this time with your daughter...and have some champagne.