Finally, I can post photos!
Grace doesn't usually stray far from the food and water dishes! She was keeping an eye on the water dish in which I had put ice cubes (she and her boys seem to like their water COLD!); I think the crackling sound was a bit unnerving for her!
She will also seem to guard the water dish, and then drink a bit, guard some more, drink some more, etc. This can go on for quite a while, and her boys know enough not to come too near when she's in water-dish-guarding mode!
Fun li'l family!