Maid of honor does not invite you to her wedding?

Michelle
I got married back in January and my maid of honor is now having a sizable wedding in October which my husband and I were not invited. We did not have a falling out that I'm aware of, even after she was kinda MIA as my maid of honor (no shower, bachelorette, even told me she couldn't make rehearsal dinner due to work obligations). I gave her option to be a bridesmaid instead if she felt more comfortable with her work restraints. She said no, she stood in as my maid of honor, but we haven't really talked since. My feelings are hurt and I'm not really sure if I should approach her and ask what happened, why I was not invited or just let the "friendship" end. I asked my other bridesmaids if they noticed anything on either of our parts on day of wedding and they didn't notice anything off. Any advice would be great