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It very much depends on the hamster. If your hamster is spout chewing and overdrinking too much water that is bad for them so I would always go with a bowl then. Bowls have a drawback though that you do need to make sure they are checked frequently as they do get contaminated with bedding when the hamster digs around. Do whatever is best to stop them overdrinking and spout chewing. I don't think she will have eaten the balls or the spout. It will likely be in her store. Bottles need checked every day as well to freshen the water and also to ensure the water is flowing freely. Just run your finger over the spout.