Do I Worry Too Much?

Yes, I do. I know all mum's worry but sometimes I wonder if things just pop into my head and won't go away until I've convinced myself that something is wrong. I've had various worries about all my children at one time or another. Some of them have been confirmed and some haven't. Well, actually, most of my worries have been confirmed, which in turn is even more worrying.
At this present time I am worrying about leila. She's just finishing Reception class to go into year 1. Her teacher says she's a good girl at school, and although she was really shy at first she now has no problems mixing with other children. She also says that she has struggled a lot with her school work but always tries really hard and is now catching up.
I worry about her teacher!
Leila is nowhere near as clever as Lucy was at her age, I know kids are different and develop at different rates but this is a BIG difference. Leila doesn't seem to have many friends at school, there is a little girl who she walks to school with because I am friends with her dad, but she doesn't talk about her out of school, and as soon as they are in the playground they separate. Three other little girls are very close, and although they will talk to Leila it's quite obvious that Leila is not 'in' with their group (yes I'm talking about 5 yr olds!)
The boys take to Leila, they crowd around her and ask her to play. She doesn't often join in, but she does like the attention. So as far as I can see, Leila doesn't have any real friends, although she does mix a little.
Now her teacher says she is a good girl and always follows instructions. This is hard for me to swallow because at home when I instruct her to do something quite simple she looks at me with a blank expression like I've told her to solve a difficult mathematical equation. I went through a stage thinking she had a problem with her hearing because I could say something quite clearly right to her, and she would just look blank like she hadn't heard. I've had a simple hearing test which came back ok. When she is being naughty it doesn't matter how I try to deal with her she just carries on. Then sometimes I end up getting angry with her and she starts crying not knowing what she has done wrong.
Maybe she's just a normal kid, who's to say what's normal anyway? So far none of mine have been 'normal' so how am I supposed to tell?