If ANYONE can help me identify this book, I will love them to the end of the earth. I believe it's French-Canadian, and originally written in French, sometime between 1970 and 1995.
It's about a girl (whose name I forget) who gets into a fight at school then goes to hide in the janitor's closet to avoid getting in trouble. There she is electrocuted by a faulty floor-polishing machine. Her spirit is accidentally joined with that of a time-travelling being called Entity.
The girl doesn't want to die and Entity doesn't want to drag her around, so they have to try to find a new body for the girl. However they can only take someone's body at a time where they do not wish to be themselves anymore, so she winds up trying to get out of various horrible mishaps including being eaten by a dragon. Eventually they discover that they can change time, so they go back to where the fight happened and prevent the girl from going into the janitor's closet, but in doing so they cause the boy she had the fight with to go there, so he gets electrocuted and joined to the entity.
If ANYONE knows the title and author of this book, please let me know. I read it as recently as a year ago and it would be really comforting to know that I'm not completely insane and imagining this, as nobody I have talked to has heard of it and more than an hour and a half of Googling has turned up nothing.
ETA: I have checked Abebooks.com and I'm having no luck there either.