Sorry it has taken me so long to get back to this thread - first day of school today, so I have more time!
SM is nothing to do with anything you did or didn't do - dd's nursey teachers thought dd's was caused by her going to another nursery part-time(I was at college) but the psychologist says, it is usually just something that will happen anyway because it is in the child's personality, not really due to events in their life.
Dd has started school today! The speech therapist made her up some picture cards so she can tall the teacher if she needs the toilet, or is feeling unwell.
Dd has been improving so much over the last year and a half. 18 months ago she would only speak to me, ds, and 2 friends (never in nursery though) she wouldn't even speak to dh because he had been working away. Now she will speak to other close relatives, and a few adult friends. She even spoke to one of her nursery friends when she came for a play at our house.
I think she has had a bit of a setback since ds2 was born, but she will get there in the end. After more than a year of waiting, she was finally seen by the psychologist (although we have yet to get any feedback) and the SALT has been in touch, but hasn't actually seen dd yet - says not really much to be gained by visiting dd at home.
HTH a bit. Sorry if this seems a bit rambling, but am trying to type really quickly to get finished before ds2 wakes up!