What on earth was in the photos? The lesson here is to be careful what photographs you have taken.
At a wedding, I'm guessing that the photos were of the, erm, wedding ?
I can understand a bride wanting to release her own photos of the big day herself, not to have someone else put them on Facebook for all to see before she has a chance to do so.
She can't really 'be careful about which photographs are taken' at her own wedding, can she? People will take snaps, particularly in these days of phone cameras, but they won't be the professional ones that the bride may wish to show people first - remember that the number of guests has been limited, too.
In any case, it doesn't matter which of us would be annoyed by it happening. The fact is that the OP's granddaughter is annoyed, and that needs to be respected. The OP has done so, and like others, I hope that the granddaughter has forgiven her.