I'm glad Gluesister had the good manners to reply.
But I wouldn't engage any further if I were you.
She understands exactly where you are coming from, she knows you're not going to reconsider and I don't think she blames you one little bit, but she had to mention it to you so she can tell Gluezilla she did.
I'd leave it now. Everything has been said, several times, there's no real point in repeating yourself again. They are just going to have to accept you've said your last word on the subject and make other arrangements. If you reply again Bridezilla is going to feel she can still convince you because you are still responding.