Really hoping for useful suggestions ... sorry if it sounds like I am policing the thread but please, no "you sound like you don't like her very much, OP" as I do "like her."
She's my (half) sister, the product between my stepmother who isn't a pleasant person, and dad. Just done her GCSEs; will turn 17 in September.
Lots of behaviour of the sort that I'm trying to train DS2(3) out of now: nose picking, bottom scratching 
and so on.
Tells tales on her classmates, to the point where even teachers have become exasperated. Shouts out answers again, to the point where teachers become exasperated.
Tries to make out that she has an exciting life outside of school which is a shame really - she will take her "diary" into school and sit there writing in it and then when a kid comes past innocuously to put something in the bin or something will grab the diary and shout theatrically "No! You can't read my diary! I've written all about last nights party in it, you can't read it!" Obviously, the other kids are at this. She used to get bullied, now she is mostly tolerated but has no real friends.
She belongs to a drama club outside of school and performs a lot - starts dancing in supermarkets and then declares to no one in particular she can't help it, she was born to dance 
They were studying Blood Brothers in school and she insisted on singing the songs to everyone. She's okay - not great, but she tells lies (like saying she got through on BgT and so on.)
Deep down she is a nice person and if she was ten or eleven it would be fair enough but nearly 17 doesn't seem quite right, somehow?
Parenting teenagers has its ups and downs. Get advice from Mumsnetters here.
Teenagers
Immature 16 year old
Calyrical · 09/06/2017 16:59
IME a lot of teenagers take much longer to 'grow up' than you might expect. I've had 6 (well, still have two in process).
Think early to mid-twenties before you can expect adult behaviour. (Just because you grew up more quickly - I'm sure you did without you even saying - doesn't mean she will or should.) In the meantime, back off and leave her the fuck alone, as you don't seem to have anything supportive to offer her.
You sound really judgy. It sounds as if you don't like SM and HS is paying the price. If she is already struggling, she doesn't need you judging her as well.
Sorry if it sounds like I am policing the thread but please, no "you sound like you don't like her very much, OP" as I do "like her."
Sure you do.
I wouldn't say I did grow up quickly but I wasn't scratching my arse at 16.
One to one she is likeable. I don't like SM but I think this is relevant. SM isn't pleasant to me or to HS.
Now do go and find someone else you can accuse of not liking a relative because they've taken the trouble to ask for help 
Why do posters post something in detail, then not add crucial information till way later....
If her mother is an abusive alcoholic and her father gives her no attention it's hardly surprising she is desperately seeking attention elsewhere.
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Not in front of thirty people you don't, Funnyfarmer, I'm sure
Look, I realise some people will always have a problem with an OP, but seriously, it's not AIBU, it's in teenagers, because I wanted actual advice not people insisting I'm a twat. (If you DO think I'm a twat you are very probably right but - not on here, please?)
She is going to college to do A levels if her grades are up to it.
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