A place for a good friend

I didn't ask one of my very good friends to be in my wedding. My fiancé and I don't have a ton of friends so it just worked out to have my sister be my maid of honor and one of my oldest friends be my bridesmaid, and him do the same with his brother and best friend. But because my sister is in college a few hours from here and my bridesmaid is a mom of 3 and also lives a few hours away, my other friend has been helping me with a lot of planning. I really want her to be apart of our special day because she has been gracious enough to help with everything but I'm not sure how to do it. I was possibly thinking an usher, but any advice is welcome! via /r/weddingplanning http://ift.tt/2tIx3Pi