Skylar Storm is a character in the series, Mighty Med.
To the general public she is a comic book character that Kaz and Oliver like. In reality, like many comic book characters, Skylar Storm is not imaginary, but a real person. It turns out she is in the hospital because all of her powers have been taken away by the "comic book" villain, The Annihilator. She regained her powers, but has ended up as the Annihilator's evil servant.