Wedding Roles

Not sure why you need to another bridesmaid. You really shouldn't ask someone you don't have a close relationship with to be in your wedding. There have been so many posts about brides regretting including someone out of obligation. I would recommend just having six bridesmaids. You don't need to have the same number of bridesmaids as groomsmen. I also don't think you should feel obligated to include your future sister-in-law in your wedding. But if you really want to I would either have her do a reading like you suggested or hand out programs if you plan on having them.

I agree with the previous 2 posters. I am not sure why you need a 7th bridesmaid. It is good you are amicable with your sister in law but unless you are giving her a role to appease your FH I would not have her do anything more than attend the wedding. Only members in a bridal party should be your nearest and dearest and not someone you are not close with. Leads to drama sometimes.

I wouldn't feel bad about her not having a role, honestly. Like the others said, it's really not necessary for every single family member to have a role and 7 bridesmaids is a lot of bridesmaids. If you really want to include her, give her something simple like reading a poem or passing out programs or something.