grannygranby, I realise this quite an old thread but I would say please keep your worries to yourself as speaking out will only alienate your DIL. Your DGD may have problems or she may not, but as others have said, if she does they will be picked up at nursery soon enough. If and when that happens your support will be needed and it will be better if your relationships are good.
When my DGS was about two, my daughter and her partner took him to meet up with some members of the extended family who live at the other end of the country. Soon afterwards other members of the family (who had clearly been in touch with these relatives) got in touch with DD suggesting that 'there might be something different about DGS' as he 'didn't play like other children'. This caused a great deal of distress and worry for my daughter - even though she and her partner were sure the concerns were unfounded - and almost caused a family rift. My DGS is now a happy, lively almost 4 year old who goes to nursery and is developing well. I think it is very difficult to form a judgement about a child at such a young age, particularly when you don't see the child often. In the meantime I think silence is the best policy.
Heated Brush recommendation,please.