This won't be a popular opinion but, is it really up to you to judge her behavior? I would agree with you that it's not the choice that you or I might make but it isn't your choice it's hers.
Staying away from the wedding isn't going to change that. If she is someone whose friendship you value (and true friends don't judge) then I would go to the wedding and not say anything unless she asks your opinion. If she isn't a good friend and you feel that strongly then I wouldn't go.
Staying away from the wedding isn't going to change that. If she is someone whose friendship you value (and true friends don't judge) then I would go to the wedding and not say anything unless she asks your opinion. If she isn't a good friend and you feel that strongly then I wouldn't go.