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First, you need to summon Cassandra from your phone so she can take you to Maggie's Resort in her belly. Then, you need to enter the hotel and buy camping gear from Maggie for your trip to the forest (and if you want to try to get the scene where you go to bed and she climbs into your tent, you'll also need to buy a camping tent). Then, head into the forest, and after a couple of actions deeper into the forest, you might meet her—Echo. If not, then continue on and you can choose to go into the cave or continue onward. If you go into the cave, you'll definitely see her. Something like that.