Pregnant bridesmaid due week prior to wedding

My niece who has been my best friend growing up (we are two years apart) has agreed to be one of my bridesmaids! Yay! This week she found out she was pregnant (also yay!)The only problem is her due date is July 22 when my wedding is July 29th. This is her second baby so its likely to be late. What should I do? She insists on wanting to be a bridesmaid but I don't want to risk her backing out or complications arising due to unforeseen circumstances. Plus I'm most worried about the strain she would have on making the rehearsal dinner and wedding day activities. What to do!