Lillia is a sweet bb angel and I would die for her (as an aside, /u/riotmaxw3ll also worked on her).
But similar to Neeko, her amazement is less new-to-life and more blooming confidence.
I don't want to speak on behalf of that team, so I can't really say more with confidence.
Luo would have a better answer, but my read on the differences are that Gwen is amazed at everything because it's new to her. Neeko has a curiosity because she has an ethos that already exists (the connections between people and their shoma) and is reconciling that with our world view. Lillia is a much more withdrawn character who, as she blooms, becomes excited specifically about the human dreams and what they mean for their dreamers and her.