Can someone please tell me what to use to fix a broken point on a fondant crown? I had it completed & painted with luster dust when one of the spires on it broke off from the band of the crown. The fondant has been drying for a week so it was dry. I need to fix it & don't know if edible glue would hold it. It is for a groom's cake for this weekend!

Glue it together with a bit of fresh fondant.  VERY lightly wet the dry parts and stick the fresh fondant between them.

Do you have royal icing handy? That works every time. If not, then melt a small ball or fondant with just the a drop of water and make a paste.