Here is how Luna's Story of the Plunder seeds and Snowdrop's mane problem goes in A Motherly Love.
Princess Yuna: Mama, Tell us the story about the Plunder seed incident.
Princess Luna: You two want to hear that again?
Snowdrop: Yes, Luna. Very much.
Princess Sharon: I'd like to hear it too.
Princess Luna: Alright, I'll tell you.
The story begins.
Princess Luna: (narrating) A long time ago, When your Aunt Celestia and I were to stop Discord from creating chaos threw out Equestria.
Discord: Oh, this is so much fun. How about a game of 'Pin the Tail on the Pony'?
Princess Celestia: (gasp) Play time is over for you, Discord.
Discord: Oh, I doubt that. (munching) Hungry? Suit yourselves. Oh! What have you got there?
Princess Celestia: The Elements of Harmony.
Princess Luna: With them, we shall defeat you.
Twilight Sparkle: This must be when they turned Discord into stone.
Discord: (laughing) You should see yourselves right now. The expressions on your face. So intense. So sure of yourselves. (laughing) Hilarious!
The flashback ends.
Princess Yuna: And that is how we used the Elements of Harmony to defeat Discord before his return.
Prince Isamu: (embraces his mother)
Princess Luna: (picks up Isamu) You love that story, Do you, Isamu? (kisses)
Prince Indy and Princess Anna: (embraces their mother)
Princess Celestia: (picks the twins up) Mommy love you two so much. (kisses)
Snowdrop: We sure had fun with our mother and aunt.
Princess Sharon: We sure did.
Snowdrop: I'm having trouble brushing my mane. Will somepony help me out a bit?
Princess Yuna: Sure, Snowdrop. (fixed her mane up) There, Good as new.
Snowdrop: Thank you, Yuna.
Princess Yuna: You're welcome.