Evil Step (grand) Mother stole my wedding day and venue

Hi Reddit, I’m new to this so I apologize if I break any Reddit etiquette. I (25 F) have dealt with my step grandmother’s (65 F) terrible spiteful behaviour since I was 6 years old. It appears that she’s always had it out for me, my siblings, and my mother because she feels her son has wasted his life on us and that he’d do much better with a woman that did not have children from another marriage. From the age of 6 I was made to feel rejected and unloved by a grown woman and I just didn’t understand what was wrong with me. When my mother had my stepfathers children I was around 10 years old and by that point I thought she just didn’t like children, but as soon as my half siblings were old enough she’d take them to Disney world, nice dinners, and get them wonderful birthday and Christmas gifts (she’s loaded), and for what seemed like the fun of it she would get me free things that were donated from her work (breast cancer awareness T-shirts, a breast cancer awareness coin bag, etc). I understand that her bond to them was due to them being her blood, but as a child with no family other than step family, I just didn’t understand why family couldn’t love me the way I was watching my siblings be loved.

Fast forward to the present day she still treats me as a stranger who decided to join her family - my mother and step father have almost been together 20 years and it means nothing to her, we’re the white trash who never went away.

I was recently planning my wedding, we had the date of September 28th picked since last year, we had the venue booked and everything ready to go. She was invited, but her boyfriend was only invited to the reception in an attempt to keep the peace (because I don’t know him and quite frankly he’s made racist comments and I’m not interested in having him there). Once she found out he couldn’t go, she cancelled her RSVP three separate times - she even used someone else’s link to get into the website after hers was deactivated to cancel one more time after that. Awesome news for me, I don’t have to pretend I like having her there! Fast forward to May 2024 I was physically assaulted at the movie theatre in the washroom by three people and ended up with a concussion and an intense fear of public spaces. I could barely operate, let alone plan an upcoming wedding. We decided it would be best to postpone so I could take the time to heal (therapy has helped). This morning I received an invite from her for her surprise wedding and guess what?! It’s on September 28th, at the same wedding venue, down to the exact same start time! A few weeks ago she found out mine was postponed and decided it would be the perfect opportunity to get one last jab in. I checked with the venue, they had every weekend open in September and October and she chose that date (it’s not specifically a wedding venue, just very cute and cozy lodge that doesn’t get much business).

Would I be TA if I confronted her? She planned a last minute wedding exactly the same as mine without any care or heart for what I’ve gone through. I don’t have time to list all of the things she’s done throughout my life to me, my siblings, or my mother - I just can’t believe she would take it this far.