« Last post by Drunken Housewife on Today at 11:14:17 AM »
I hear what you're saying. I just don't think we have enough information to know the whole picture.
This woman could be the Wicked Witch of the West, or she could be a loving aunt who guessed really really really wrong how to address an invitation to someone who can't attend. For all we know, she would have addressed the invitation the same way had the girl been touring Europe for the whole month of the wedding.
This is not a case of someone who "guessed really really really wrong how to address an invitation to someone who can't attend." The teenager could attend the wedding and wanted to attend. The aunt doesn't want to invite her. There was a subsequent family meeting and the aunt doubled down. The aunt is using a concern trolling argument, that the aunt doesn't want her niece to see normal teens enjoying themselves at the aunt's wedding.