The girls tried to calm Pinkie down.

Fluttershy: It's okay, Pinkie. Dashie's just upset.

Pinkie: *sob* Dashie never declines my invitations! She's usually that happy go-lucky girl that comes to all my parties!

Twilight: If it makes you feel better, we'll still go to your party, invitation or not.

Pinkie: It's not the same, Twilight!!! It's more of a party when all six of you, come! *sob*

Pinkie flopped down on the table and continued to cry.

-------------------------------------

Meanwhile, Rainbow Dash paced back and fourth in her bedroom.

Rainbow: Hmph, when we were on the cruise, they didn't believe me when I said evil magic! I saw that book make her glow, they wouldn't listen to me! Obviously, Pinkie Pie's being a little too Pinkie Pie. Is this Pinkie Sense malfunction...or Equestrian magic! I better tell the others.

She texted her friends about her hypothesis, but the only responses she got were. "Very funny, Rainbow." "Nice try, Dashie!" "You hurt Pinkie's feelings!" "You oughta be ashamed of yourself!" "I think you need to calm down!" "Nothing's wrong with Pinkie, okay?"

Rainbow Dash sat down, regretting what she did with her friend. Both girls began to sing.

https://youtu.be/FGhET-zTWJ8

(Celestia: Rainbow Dash

Luna: Pinkie)

Sorrowful

Regretful

All of those years that I lost

Memory comes at a cost

Those I trusted

let me down

Everything

I tried to hide in my past

It's too late to make it okay

Right and wrong changes with time

Every old lie that's told

Every new truth revealed

Love and loss

I've known my share

We were inseparable

I had looked up to her

How can I trust again?

What will become of us?

Can she learn to forgive?

And then suddenly

he was gone...

Will she be victorious?

Was all our love for not?

At least you're safe

How could he turn

away from me?

Sorrowful

Regretful

All of those years that I lost

Memory comes at a cost

Those I trusted

let me down

Everything

I tried to hide in my past

It's too late to make it okay

What I'd give to take it all

back

So I won't get hurt

So that I won't hurt you

Foolish pride

Clouded my mind

I was blinded

I believed all those

pretty lies

So how can I fix this

And how can we move on?

I would give almost anything

I wish I could be ignorant

I know that I messed

it up but

I don't deserve this

I want to forget it

But it doesn't

work that way

Sorrowful

Regretful

All of those years that I lost

Memory comes at a cost

Those I trusted

let me down

Everything

I tried to hide in my past

It's too late to make it okay

We both know sorrow and regret

You denied me

my past

I'm only trying

to do what is best for us!

Well I never asked for this

I never wanted this

All that I want is to be

your equal!

Look into your heart

You'll see that I'm...

Just get away from me!

Please cease your empty pleas!

You're always trying to be

somepony else!

Now, I realize I'm

all alone

But I'm right here

by your side!

But all that you've

done is lie!

Please do not

turn away!

There's nothing that

you can say!

You cannot understand

You're always resistant

Stop (Just) apologizing

I feel something missing

I just want

to go away (my sister back)

Why can't

you leave me (we just get)

Alone?! (Along?)

But meanwhile, the book in Pinkie's room glowed green, could Rainbow Dash be right?