Sending that letter would have been a massive mistake.
Trust me - I sent a last ditch letter, and I’ve regretted it ever since.
Your two options are: 1. Completely ignore her trip and have a great time on your own 2. Move her stuff out and get your lawyer to send a letter
Of those two options, number 2 is much more likely to result in a reconciled marriage. But very few - if any - who are new to this site have the conviction to do it.
It’s okay to be sad without her. But remember like we’ve told you a thousand times already - this is about her and her alone.
There is literally nothing you can say which is going to change her path of destruction.