My two cents again.....
Petipois,
How symbolic and how much is she recreating?
Where I live (USA), couples spend a lot of time composing meaningful vows that they read to each other during the ceremony.
A special song ('their song') ....is their first they dance together as a married couple. The wedding dress is chosen to impress the groom for that all important walk down the aisle! The choice of rings is also symbolic.
If my son's bride insisted on things like he wear a certain suit, use an unusually different church, use same ring, same music or a wedding song that wasn't theirs, that would be a red flag. A fantasy where my son could inadvertently be a surrogate for the 'real' thing, would be very worrisome and what about when the fantasy is over?!
But, it may be that she truly loves her dress (and I hope that's all it is), AND if all her other wedding 're-dos' are inconsequential (as opposed to symbolic).....then and only then, would I do my best not to blow this out of proportion.