Eris began by following her sister, because Enyo had always been the smarter of the two of them and she knew it. She didn't admit it, but she knew it. She came up with the fun ideas, but Enyo was the one that actually made them happen. So if her twin had an idea where to look, then Eris was willing to go with that.
After a moment, however, she veered away from Enyo. Something was pulling her a different direction. It could have been the smell of the food. It could have been a pretty face. But there was something that made her turn the way she had. And she was pretty sure she'd made the right call.