A little anxiety over this one

Our niece Alex is getting married July 3rd in San Diego.  She is the sweetest.  And she thought it would be fun if her nieces Claire and Mallory and her cousins Charlotte and Abigail were in the wedding.  You see Claire and Charlotte are less than a month apart and Mallory and Abigail three months apart.  Cute as can be, right?  And teamwork is good for following directions and doing that "walk down the aisle" thing, right?
Well all Charlotte has said when I've shared fun things about Alex's wedding are "no" and "I don't want to" and "uh-uhh". 
We tried on the dress last night.  The face tells it all:

But she sure looks pretty!

We're hoping she cheers up when she sees Claire in a matching dress and Abby and Mallory in coordinating ones.