YA (?) novel about a school mystery

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YA (?) novel about a school mystery

gen. 19, 4:00pm

I read this one like two years ago and only wanted to re-read now but I forgot the name or the author.

This one's part of a trilogy and all the book covers have some sort of glitterly skull pin on something like a phone case or a skirt

The plot: Rich private school girl gets expelled for almost burning down school, has to go to different school in different area, finds friends and has to solve a murder mystery or something like that.

I'm pretty sure the title of one of the book sin the series was 'wicked little thoughts' but I couldn't find anything for it.

Book that I'm asking for is the first book in the trilogy to clear things up :)