What episode does Elena wake up from Kai's spell?

Elena wakes up from Kai's spell in Season 6, Episode 22 of "The Vampire Diaries," titled "I'm Thinking of You All the While." In this episode, her friends work together to break the spell that has kept her in a comatose state for years. Once the spell is broken, Elena is finally able to wake up and reunite with her friends and loved ones.