I just got married in November and I am the oldest and the only girl in my family. So I can sympathize with you and your daughter. Everything will be great and you will be so surprized that everything you are SO worried about right now will work out great or won't matter in the excitement of the day!!
Congrats to your daughter and her soon-to-be hubby!!
P.S-just remember to put your game face on and be there for your daughter, thats most important.
Hope this helps.