Lana and Clark purposefully bring Chloe in to help them "think outside the box" after Lana looses a senior citizen while volunteering. Clark introduces her as "the rude one" to the now young Harry in the Beanery.
When meeting with Cassandra, he sees her vision -- of him outliving everyone he cares about. The name "Chloe Sullivan" comes up in-between "Pete Ross" and "Lana Lang" but we never see one for "Lois Lane" nor "Lex Luthor." Now, it's not clear if the order is the order in which they die, in an order of importance to him (because it started with his father), or merely in some random order that he saw them. Also, since he wasn't friends with/didn't know Lois nor Whitney at the that time, it is possible reason why he didn't see their graves either.
Lana finds the Wall, more importantly, her picture on it. Clark tells Lana that he believes in Chloe's Wall. Lana complains about her fairy princess image.
