Coraline's life started in Bandon, Oregon on August 28th. She had a mother and father, way back then, who worked for a catalog on...gardening, which she's slightly interested in (and a total master of). She doesn't look back much, because it's normally too bothersome of a story for her, and therefore she's forgotten pretty much everything about them, including the gardening. They did basically forget about her, after all, and left her to fend for herself, within their home, of course.
Coraline spent time elsewhere, as much as she could, because her life was just too boring in that bland, pink house. She had neighbors, retired actresses who really needed to get their lives worked out (seriously, who has that many dogs), who she found quite interesting. She often spent her afternoons with them, but she never really trusted them. It was normally because they were entertaining, and she didn't want to be stuck in a dark house all day (which, looking back on it, theirs wasn't much better). One day, she decided to tell some tales about how her parents treated her, which weren't at all true. She never found out the exact happenings that led to this, but she was taken out of her house days later and placed in a foster home, of sorts.
Coraline's new parents, who ended up adopting her without her consent (not like they needed it) and moving them to Wales when she was just about to turn ten, were exactly like her last, just much nicer, so it came easy to her when she wanted to completely forget about everything else. She even realized that they looked nearly exactly the same, but these new ones had rather black eyes, with zero color other than the irises, and white isn't even a real color. She took that as the opportunity to act like they had been their parents the whole time, since nobody knew any better, and she soon convinced herself of it too.
Coraline had no idea that she was a "late bloomer" and she didn't get her first sign of magic until days before she turned eleven, which she doesn't really mind, at least not too much. She had been walking outside of the family's house, wandering around, when a rather annoying cat began bugging her. She hates cats, that is all one would have to say to justify her next actions. She hadn't even done anything, since she was just standing there, and the cat went flying, landing far off into the distance. She later got her letter to Hogwarts, and was somehow not shocked at all by it, even if she had discovered her magic just days earlier.
Coraline didn't do much at school, normally remaining in the dark sections of the castle, for her first several school years. She later adopted the cat she kicked, even though it still annoys her. She just pitied it, like she does with most creatures, especially humans. She's even discovered that her new family is quite odd, and she's wondering what their problem is, which is a bundle of thoughts she would love to block out.