Cipher's Sister (Gravity Falls OC Backstory)

"We don't need you. This Realm doesn't need you. Nobody will miss you, and nobody will care."

Bill Cipher, the infamous illuminacho. But this story isn't about him, it's about his sister, Shadow Cipher.
Shadow always had to tread carefully, as everyone was familiar with her brother and would assume she had the same intentions. Even as she got onto the Demon Council, other demons would still point and whisper when they saw her. But Shadow worked hard to make own name and prove she wasn't all bad.
Unfortunately for her, just as the demons are starting to warm up to her, her brother decides to take over the third dimension. All Shadow's hard work comes undone and she's thrown from the top to the bottom.

In an uncontrollable rage, she accidentally attacks the Queen and gains permanent banishment to the third dimension.

How will she cope with her new life as a human?