I quite frankly don't understand her desperate need to get Tiny to do this, to the point of alienating her.
Possibly because by this point she is utterly blinkered to anything other than bending circumstances and people to comply to her plans. This doesn't necessarily make her a bad person though.
The most thought-provoking comment on this thread has been this:
I also remember the same things being said about the mother in the naming ceremony thread and it turned out there were underlying reasons for her behaviour that no-one could have guessed
Just because the bridezilla has lost all sense of perspective, it doesn't mean the OP has to go in feet first to provide more drama for our entertainment.