I wouldn't be spiteful to her either. I just would not, ever, ever, in a million years be arsed to speak to her again. Don't answer the phone when you see it's her number, if she blocks her number and you answer and it's her, just hang up, don't return her voicemail messages or texts, and if you see her in public, look the other way.
If she approaches you or comes around to see you to find out why, say 'are you actually kidding me right now?' And slam the door in her face.
I doubt she will bother though, as she probably knows she has behaved like a cunt.
Don't bother writing anything to her though, as she won't give a fuck anyway. If you meant anything to her, she would not have uninvited you to her wedding. Just ignore her. Best way to treat people who have treated you like shit. Really fucks them off if you cut them dead as if they don't exist.
She must have known the groom's extended family needed to come before. Her uninviting you to make way for them is bollocks I reckon.
My money is on her husband-to-be fancying you, and she has found out.