Amethyst: Princess of Gemworld

Plot
The story starts with a teenage girl named Amy Winston sitting in her room playing a handheld video game when she all of the sudden gets called by the game and gets transported inside Gemworld. She's told she's the princess of this world and must go on a quest before she can be sent back home on Earth. Aided by her own alicorn and some sort of magical energy sword, she comes across several challenges caused by the bad guy of the game, Dark Opal along with finding Prince Topaz, the defeated hero of the game who gets reduced to skeleton. By the end she manages to defeat Dark Opal, restore the Prince, and with her quest ended, she gets sent back home