Job for new sis in law at wedding

I have a sister in law who seems a little put out that I asked the other sister to be bridesmaid and not her. Looking for a job for her that will make her feel a little special. Any ideas?
She can't drive so can't get her to collect anyone or anything but was thinking of getting her to do a reading at the church but not sure if she will go for that so any suggestions will be great. Getting married in 7 weeks so getting her the same outfit and making her bridesmaid too will be a bit rushed....i would have to get a similar dress made.....