DD3 has always been a challenge which we have found many excuses to cover up for in the past including her being a middle child.
We moved her to a new school in Sept because she wasn't making any friends and had got into some difficult situations and the school said she was a bully (they actually said it was like watching a controlling boyfriend manipulate his girlfriend) she was 7.
I did ask them before we took her out whether the thought she may have some underlining issue but I was told she didn't struggle to concentrate and was sitting above average in her school work so it was just her personality and she would grow out of it.
Her new school teacher doesn't agree and told me today that DD is the natiest child in the class, she will have no friends as she isn't able to let others be themselves and dictates and dominates anyone that will let her anywhere near them.
She finished by saying that I should see our GP about her behaviour and that she wants DD to see the SEN nurse.
I don't understand what this will mean for DD and what to do for the best, I have looked at the boards on SN here but it's like I'm reading a foreign language and I feel a bit sick tbh.
I also feel guilty that I should have spotted it myself and had her seen sooner, she is so very different to my other children (I know they are all different but I mean Different) I have in the past tried stopping different foods and arranging 1:1 playtime - never a success 
If you got this far then thank you.