You say that you'll keep that in mind, then ask Moondancer if she knows anypony who would be able to cast such a spell.

Moondancer: "I don't. Somepony would probably have to dedicate a lifetime of studying to perfect a transmutation spell of this complexity."

You ask if Twilight Sparkle could help, and mention that she said her specialty was magic.

Moondancer: "Wait, you know Twilight?"

You tell Moondancer that you only just met, and that she inscribed some runestones for you.

Moondancer: "That sounds... rudimentary... but you're right. When it comes to magic, Twilight's always one step ahead. If anypony can help, it would have to be her."

Sea Swirl: "Why don't you ask her about it when we get back, Moondancer? You two would make a great team!"

Moondancer: "Yeah, I guess... but... you know..."

Moondancer trails off as she begins to daydream.