I'm sorry but this might be long...
I just don't know where to turn any more. Her behavior is becoming so bad that I don't know what to do.
She can cause an argument before I've even woken up properly. She has this constant need to dictate to me and my partner what we are doing. When we are doing it & how long we can. She is rude & so full on that I'm literally at breaking point.
She will talk and answer for everyone even if its an adult conversation. Even if she isn't in the same room you can guarantee her answering it. She has this obsessive habitof ssneaking around, listening to my private (or sometimes not) conversations and will willingly go and repeat them to anyone who will listen (she once told the lollypop lady I was on my period 
) she has no filter. At all. She walked up to my sisters boyfriend who she had never met, and stated that she hated him because he looked scary!! Why??!!
That's what I seem to ask myself a lot. Why? At school she is greatwith hher reading. Everything else is poor. She has no friends and is a constant target for bullies. Her teachers want me to do a 'Question book' ... Its a book dd has to carry around with her all the time & write in it before she can ask said question , to make her realize some questions are either a) pointless or b) irrelevant to that situation. (For example, the class where making paper masks and she randomly asked what the weather would be like in Spain?!) Her teacher seems worried but not worried enough. She has to tell dd to be quiet & to concentrate at least 4/5 times before lunch.
Her other 'obsession' is the toilet. If we go into a new house, cafe or restaurant she will hunt out the toilet. Instantly. So now we ask if sherreally really needs to go & we do often go with her now (in the cubicle) to which she admits she doesn't really have to go! That happens a lot in our day to day life. Even at school.
I feel like I'm talking & shouting at a brick wall daily. You can give her instructions and it's like they never left your mouth. She doesn't 'hear' them or 'forgets'
I admit I have fell short a few times & cried in front of her & she just looked at me. Smiles and walks off.
She will answer for me, tell me things that I don't need to know ( she can tell me how many children every teacher has, if they are married or not too) I know who has what & where .
The other thing she does is , for example. I said to her earlier her button was undone on her new PJs .. To which she replied with out even checking no it's not. It's like it shoots out before she knows. She will ask a question. I tell her the answer & all I get is "No its jot" I feel like screaming "WHY ask me then?? If you surly know it!!"
If I'm talking to her step brother , she will start talked for him. I tell her to be quiet & she doesn't. She just carries on talking over me. She gets louder & louder. So her step brother can't talk because she gets in there first.
I feel like I'm raising a 4 year old. It feels that every year she gets older , she gets a year younger. She will fight with my 3 yr old niece for her toys. She is obsessed with babies dolls & buggies. I have seen her get physical & through a massive tantrum if she cannot hold the buggy. She will play with toys in the age range.of 1-3. She cannot do maths at all. She can't even brush her own hair. She has the compulsive need to be a commentator at every event or anything we are doing. She will draw a line on a piece of paper & run in to me shouting me to show me this one line.
I have punished in taking things away. Grounding. Losing out. You name it. But it doesn't count anymore. It's driving a wedge between me & my partner. The whole situation is driving me to sign her over to someone who can cope. Because I'm at my limit now.
I am starting to resent her more and more everyday. I am starting to hate her in fact. I want to love her. I do. But I don't know how anymore. I'm sick of crying & shouting & kicking myself.
What more can I do? Luckily she isn't violent. But still....