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BRITISH MOM FINDS TEENAGE DAUGHTER MURDERED.

It is from late 90's to early 2000's. It was a mother who found her teenage daughter murdered (someone else found the body and the police gave her the bad news). She was found on her school uniform on a kindda vacant lot (among trees and stuff). She was a "perfect" daughter and as the police couldn't find the killer, her mom started to investigate the murder herself. She started to seek for clues and investigate her daughter's life. Of course, the girl wasn't what her mother thought she was! The mother finds out that her daughter was involved with illicit stuff and with some Arabic men. I think she was involved with drugs and prostitution too (I am not sure). The mother begins to suspect the Arabic men, and she ends up getting to know a friend from her daughter's. This girl that the mother begins to be very fond of and kindda considering her as a daughter too, is the one who actually (by accident) had killed her daughter at the end of the movie. I do not know if I explained it well. I hope someone will be able to help me!
asked Mar 14, 2014 in Name That Movie by mimiko33 (849 points)
I've read your question a number of times, but nothing comes to mind. It doesn't sound familiar at all.
I really appreciate it! :) I know that if you come across some movie that rings a bell you'll remember my question and give me some hint or even the right answer. ;) Thanks again, dear.
You're welcome.  I wish that I could help.
The dates don't match up, but it sounds so much like "In Her Skin"(2009) that I thought I would give it a try!

http://www.imdb.com/title/tt0995851/

You can watch the trailer here........

https://www.youtube.com/watch?v=1iBdOzwXEHQ
I thank you very much for your answer but unfortunately it's not the one i'm talking about. I have already watched "In Her Skin" and it's an excellent movie as well.
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