My FI has been friends with a girl since high school. I know how much it would mean to FI to include her in our wedding party and I would be more than happy to! But to me, she is more of an acquaintance. She is also out of town for us. All the poems and stuff I've been reading of how to ask someone to be a BM seems cheesy to me and we don't really have much of a history since I only know her through FI.
Should I just write a nice note to her on a pretty blank card saying that we would both really like her to be involved in our wedding party? What would be the best way to go about asking her?