Found another Dragon's Tear in Tears of the Kingdom. I guess that scene confirms that this is a time-traveling Zelda in these Memories, and when she disappeared at the beginning, it sent her back to this time period, for whatever the reason. Rauru suggests we aren't operating in a stable time loop since Zelda's appearance was something that didn't happen originally, so maybe now they can find a way to stop Ganondorf that they didn't find the first time. I'll be curious to see how they link the past with the present (this time, Zelda is the link to the past, lawl).