I am paying for all of my bridesmaids and mother to get their hair and makeup done for my wedding. My FI's sister happens to be in my bridal party so she is included. My future MIL mentioned that she wasn't sure if she would get her makeup done but she's been having some hair trials on her own for a style for the wedding. Should I invite her (pay for her) to get her hair and makeup done with the rest of us?