I've been re-reading Esther Pearl Watson's comic series Unlovable. The series is written as a series of single panels illustrating days in a teenage girls diary. The artwork is crude and unflattering but has a compelling reality about it. There's a kind of genius under the trashy scribbles.
I've read two of the books and there's a third I've been keeping an eye out for. After my second reading I decided I had to look up the artist and find out what the deal is with this series. I found an interview where the artist says she actually found a girls diary in a Texas gas station and has been drawing pictures from entries in it. This goes a long way towards explaining why you feel so heartbroken when the girl's friend's abuse her.