My MOH just stepped down 1 1/2 weeks before my wedding.she said it's because she can't deal with it right now,which I get.She has been dealing with major depression the last six months and I want her well not more stressed over this.Anyway I want to ask one of my other bridesmaids,my future sister in law to be my Matron of Honor since my MOH stepped down. Is this proper and what would be a creative way to ask?