The blonde witch listened intently, tilting her head as her potential new friend spoke. "How did you mess up? Can you fix it?" Obviously Luna had no idea who Barry meant, or she would have kept her mouth shut. "Were you mean to her? I have a friend and sometimes he's very mean to the girl he liked back home." Luna never sugar-coated her uncomfortable truths.
"Oh! I'm glad you have a friend from home." A pause. "You seem nice." She didn't know River, exactly, but had a vague knowledge of her from the network, like most people in the Dome.
"I'm pretty sure they must employ a witch who casts a charming spell." Or nargles, but they didn't seem like the burger smell enhancing type.