@Vree
I wouldn’t mind something like this as long as it was all a misunderstanding. As a Silver Spooner, I’m naturally biased against ideas that’d end with Silver Spoon being removed from the cast. Big surprise, I know.
Here’s my own take on your idea: On the last day of school, Silver Spoon learns that her Filly Scout troop is going away to camp in the Smokey Mountains for the summer. At first, she’s excited, but Diamond Tiara is utterly devastated - she’d been hoping to spend her summer with Silver Spoon. Upon seeing this, Silver Spoon decides to figure out a way to stay home. Eventually, the two fillies turn to the Cutie Mark Crusaders for help. After trying a number of (unsuccessful) ways, ranging from faking being sick to hiding out in the Crusaders’ clubhouse, Diamond Tiara and Silver Spoon are at their wits end.
While walking back home, Spoon, Tiara and the Crusaders bump into Twist (or maybe another filly like Tag-Along/Ginger Snap), who says she’s excited to be going to Filly Scout camp with Silver Spoon. Silver Spoon informs her that she doesn’t want to go, leaving the poor filly heartbroken - she’d been hoping to spend her summer with Silver Spoon, since they spend so little time hanging out during the school year. Silver Spoon is unsure of what to do: either way she’s going to have to leave one of her friends behind for the summer. Diamond sees how upset Twist is and tells Silver Spoon she should go, because she realizes that she isn’t the only pony who wants to spend time with Silver Spoon.
Silver Spoon is surprised by this, but she decides to take up Diamond Tiara’s offer and go spend the summer with Twist at Filly Scout camp. Diamond lets out a sigh and says she’s upset she’s going to have to spend the summer alone. Apple Bloom places a hoof on Diamond’s shoulder and tells her she won’t, since her and the Cutie Mark Crusaders will keep Diamond company while Silver Spoon is at camp. Furthermore, Silver Spoon promises to send plenty of postcards to Diamond while she’s at Filly Scout camp.
Cut to a scrapbook filled with a montage of photos and clips from Diamond and the CMC’s summer, interspliced with photos and clips of Silver Spoon and Twist’s summer. The episode ends with Silver Spoon and Twist coming home from Filly Scout camp and meeting Diamond Tiara and the Crusaders at the train station. As the two groups of fillies walk into the distance, they can be overheard talking about how their summers went.