Probably the kitten died first, and the mom then followed her instinct of keeping the nest odor free (to help hide from predators) and started to eat it. It really does sound to me like something is not right with the health of the mom, the kittens or both.
In other words, it wasn't you walking in on her now and then which caused this.
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In other words, it wasn't you walking in on her now and then which caused this.