Hi,My son is 6 and has selective mutism.
He does'nt talk at school at all but does talk at home but finds social situations difficult.
With my son they discounted any links with autism.
Am not sure if the two are connected.
Was there anything that happened at nursery that could have triggered her sons muteness?
With my son we think it may be because he has a speech disorder and displays perfectionist traits so hates to get anything wrong.
We think he fears that people will not understand him .
If it is SM then SM is anxiety based so at no point should pressure be put on him to speak or have too many questions put to him as there is that expectancy to answer and therefore talk.
This could regress him even further.
Is there any way your friend could stay and help out in the nursery at all?
Having her around may build up his confidence and if he talks to her in nursery it will get him used to talking again in that enviroment.
Maybe in another room to start with to gage his response.
Ido this with my son.
The "sliding in technique" and we read in another part of the school and gradually work towards talking in the classroom and introducing other children/teachers in to the session.
Although as your friend has'nt had a DX it may not be SM at all.
She would be best to got o her GP and voice her concerns and he will refer her to someone who can help.
I have found that is still a lot of ignorance surrounding SM and it is still quite rare although becoming more known.
Don't be fobbed off with he is just shy or being stubborn.SM is not about stubborness.
It is an inability to talk in certain situations NOT A CHOICE.
It is anxiety based and a phobia of speaking.
Your friends DS may not have SM but I could recommend some books to read and a good orginisation that has guided me and made me think "yes that's just like my ds"
Tell tour friend to go with her instincts .
I am by no means an expert but have been dealing with my ds's SM for 2 and a half years now so if there is anything she would like to ask me will try and help.