How to tell your best friend that she hurt your feelings?

Hi there! I just kind of want to get an idea what everyone would do in this situation. So my best friend is planning a wedding here, which is really exciting. However, the thing that hurt me was that instead of her asking me to be a bridesmaid, she asked me to be a “bridal party attendant.” Which was a big slap in the face here as we have been friends for 10+ years and have always talked about being in each others weddings. We talk for long periods of time, but she does live out of the state. It’s not like when she comes home we don’t see each other, we do. I feel like I need to tell her as this was a big slap in the face to both me and mom, as we are like sisters and my mom was like another mother. She has five bridesmaids and I think I know two, possibly three. But wouldn’t you want your oldest friend by your side? I just feel really hurt and questioning how to tell her that she hurt my feelings. Would you do it before the wedding or after? And how would you say it or would you even bring it up? I just feel like I need to say something as it hurts and want thoughts on this here. Thanks.
How to tell your best friend that she hurt your feelings?
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