It’s hard to say what came first: the lake or her. She didn’t remember a time when she didn’t swim in these waters. The locals — whose lifetimes of memories she ingested along with the rest — believed she was created along with the lake, by Ju himself, but she remembered no such incipient event. She wasn’t even certain this ‘Ju’ really even existed, as she couldn’t remember ever encountering him or observing his influence.
Perhaps he was myth. It would explain why he did not protect his servants from her hunger when they came to the shore to wash or drink.