Wingin it School Spirit

Lou (Lexi Soha) is an Angel in training who is seen in "School Spirit". She was sent down to Earth about 50 years ago and accidentally cast magic which trapped her in an alternative reality.

In the episode we discover that she has been missing for 50 years with none of the other Angels knowing where she was leading her to be classed as Missing. When Porter accidentally sends Carl to the same alternative reality after he makes Carl's mother no longer his mother.