While AB made a short appearance, Sweetie Belle is the only CMC with a speaking role in season 4.

Yay!

2239095
Yay Sweetie Belle!!

2239095 wooo!

2239095

And I was fighting an old enemy of mine!

--Sweetie Belle

2239230 And your horn was glowing, Blue? What's with that?

2239703

Yeah, my magic should be green, the same color as my eyes..

Rarity's magic was that same color of blue, and it's normally another color of blue. I think that means either Rarity's magic was grabbing me by the horn and it was totally not my fault, or when the tentacles messed up everyponies magic, it turned it all the same color.

I kinda prefer the first one...

--Sweetie Belle

2240199

Still have a bit of trouble with stairs though.