Ruins of Life
Olivia (about Faba's invitation): "Ooh, the Aether Foundation? I'm not sure what he wants with you but why not go find out? If you don't want to keep him waiting, then Charizard should get you there in no time. The Hano Grand Resort lies just over the bridge near the Dimensional Research Lab."
Lillie (visibly scared): "Th...the Aether Foundation...? U-um! I think I'll stay here"

Route 15
Acerola: "Oh! Lillie! What's the matter? You look all worn out. Do you want to rest at Aether House awhile?"
Lillie (all smiley): "Oh, Acerola... Thank you! I think I might take you up on that."

Plot hole much? Even if we assume Lillie trusts Acerola she obviously doesnt know who else might be at the Aether House