You suggest taking the tunnel back to Hoofington, and say that you might be able to learn something about the Yggdrasil tree there.

Moonflower: "Got it!"

You begin to follow the road west to the dark tunnel, where you grab onto Moonflower's tail. She leads you through the darkness, and a few minutes later, you both emerge outside in the outskirts of the Everfree Forest.

You then continue walking west in the direction of Hoofington.

Moonflower: "Hey, maybe we should get somethin' to snack on while we do some research."