Not-So Perfect 13th

TW! Mentions of abuse, neglectful parents, implied abuse of a minor, self-harm!

Katherina wanted to do everything in her power to please herself, in order to gain her parent's attention, even if meant harming, manipulating, and stealing from others, so she destroyed the happiness of others to have a lavish 13th birthday party. So when the Spiez crash her party, fight with her and ruin it, the Spiez notice hints of an abusive home and plan a small surprise for the pink-haired pre-teen.
Megan reflects on this deeply when she sees some similar scars and mannerisms on Kat's arm, that are cut a little too deep to the dark-haired teen.

or..

Operation Terrible Thirteenth episode, but i wrote it better with some better characters for the kiddos