The book was a large full-color graphic novel. It probably would’ve been published between 1990 and 2010. It was about this girl who lived in a huge palace with a very strict and secretive ‘mom’. This parental figure is rarely around and the girl is often taken care of by random people the lady employs. She gives the girl run of the place but tells her never to venture over the wall outside the palace. One day she gets mad and does it anyway. To her horror, she sees a desolate almost apocalyptic world and hundreds of slaves her ‘mom’ keeps. At first one of them was going to take her back to the palace but she persisted and found out her ‘mother’ is a very powerful sorceress who keeps the whole world under her control. A woman shows up and sees the girl standing by a man from the palace. She asks him point blank if this girl is her daughter that the sorceress took away from her. He basically says he can’t tell her then says something that strongly implies the answer is yes. The sorceress comes and finds out and drags her to the forest. She encases the girl in a small pod-like home grown into a tree where she lives trapped for years until her late teens when she escapes. She gets help from a boy about her age and goes back to the palace and defeats the sorceress. There was some part where they got help from a man a few years older than her who the sorceress had raised under similar circumstances and kept in the palace. He’d tried to defy her but it hadn’t worked. I don’t remember much else but it was long and had big pages.