Here is how the flashback ended in Yuna's First Word.
The flashback ends.
Princess Luna: And that's how I've showed it to your father ever since.
Princess Yuna: Wow, Mama. Great story.
Princess Luna: I'm glad you'd like it.
Princess Yuna: But why telling me stories about when I was a baby filly? I'm not even a baby anymore.
Princess Luna: I understand, Yuna. But if you are growing up, You'll always be my little filly too me.
Princess Yuna: Oh, Mama.
Just then, Hiro got home with Snowdrop.
Princess Luna: Hello, Hiro.
Princess Yuna: Hey, Snowdrop. How's the hospital?
Snowdrop: It was great. When I was taken for checkup, The doctor was surprised that I had very good hearing.
Hiro: She was able to recognize anyone or anypony else.
Princess Luna: Well, That's wonderful to hear.
Princess Yuna: Was she doing okay, Papa?
Hiro: Yes, Yuna. She's doing just fine during her checkup.
Snowdrop: I'm just glad to be back.
Princess Luna: Yuna, I love you so much.
Princess Yuna: I love you too, Mama.
Yuna and Luna hugged each other.