You tell Moonflower that while she doesn't look dangerous, she did manage to sneak into your cart without you noticing, so you'll be keeping your eye on her.

Moonflower: "Good luck with that. Heehee! Hey, I'm kiddin', I'm kiddin'! You can trust me, I swear!"

You ask Moonflower if there are any lights in Starfalls Town.

Moonflower: "Yuh uh, but I dunno if it's bright enough for an earth pony like you. Maybe you should use that lantern ya got in your cart."

You tell her that you can't find any bugs for it at this time of the day.

Moonflower: "Oh yeah. Hey, I know! Why don't'cha grab onto my tail? I can guide you through the tunnels to Starfalls Town. They sell bugs there!"

Moonflower waves her tail at you invitingly.