Princess Skystar is crying and upset about her mother Queen Novo telling her she they had to suddenly leave Canterlot Castle.. Princess Skystar had met up with some hippogriffs who led inland instead of turning into sea ponies and was making friends. But then the two of them had to go back their room at Canterlot Castle to get their things and that was when they both changed back into sea ponies.
 
Princess Skystar at the time then said to her mother Queen Novo that her friends the main six along with Twilight Sparkle would still be her friends even if she was a sea pony on dryland.
 
Queen Novo however not knowing were to place her anger at being a sea pony hundreds of miles from the sea then says to Princess Skystar. We are not part of their world and they will never be part of our world. I know not having any friends is hard but don’t worry about that dear we still have one another and that is what maters.
 
Princess Skystar how can you talk like mom I feel like we are swimming away from our friends in Canterlot?”
 
Queen Novo said, “Look honey we have to swim as fast as we can back to sea so we don’t dry out and die Skystar that is why we are in such a hurry.
 

 
The railroad car vector is based off of this photo by  
Tadami-line diesel railcar in Winter  
Field Stream by BonesWolbach