Advice needed

I recently got engaged and I’m starting to plan the wedding, a big part of this special day is who is going to stand by my side during the ceremony. I have 5 wonderful ladies that I want there but one of my dearest friends is so hard to get in contact with. She has a one year old, and works aa a teacher so I know she’s extremely busy. I was the maid of honor at her wedding so she knows the time commitment that is needed for this role. My question is should I still ask her to be in my wedding? So far I’ve texted and called her and no replies until a few days later or if I try to contact her again. I want her in the wedding but don’t know if she can communicate how I need her to. What are your thoughts on this?