Imagine the trouble Victoire would have had - picking bridesmaids.
All of the Weasley children worshipped her and Teddy - and there were a LOT of them.
Victoire would have to accept that she was going to have a non-existent Wedding party, or a very big wedding party. It was hard enough picking her maid of honour.
Besides, imagine he rouble picking dresses. The multiple hair colours would prove difficult - the Weasley-Potter family alone could almost fill the whole wedding.