I'm worried about my DD

[flyinglizard]

My DD is almost 13 and I'm worried as she doesnt seem to display the same behaviours as other children. Some of the things she does is:
-Randomly start jumping about (flapping her arms and shaking her head) without warning.
-Jerks her head and shoulders at random times.
-Is sometimes very social at some times and very withdrawn at other times.
-Gets angry when she doesn't win at her computer games instead of just carrying on.
-Pulls her hair out (this doesn't happen often and she doesnt pull a lot out).
-Fidgety.
-Has no concept of danger and doesn't think about the consequences of her actions.

I think I should also add that she is very clever and doesn't particularly struggle academically, although she lacks motivation and doesn't commit to anything.

Is it possible that she might have a mental disorder?

[bitheby]

Is it possible that she's 'stimming' - making movements in order to regulate her emotions. This is common in autism. Or are the movements more like tics?

[HollowTalk]

I would look up autism in girls, OP; you might find that her behaviour's consistent with some of the things they list.

[peanutbutterandbananas]

It is possible, these aren't uncommon symptoms and may be signs of her being somewhere on the autistic spectrum. I think you should go see your GP.