Generally the galley tours are held on one of the sea days and look for the day and time in the " FUNTIMES" I have been on them several times. On ships with two dining rooms and two kitchens the tour is given through a clean almost empty galley. On the Miracle the tour was given while they were preparing dinner items for the one dining room.
The Behind the Scenes tour is limited and usually about $99 so a lot of people head to the dining room for the galley tour.
Good luck and I hope she has fun.