Thank you for the replies.
We don't really have a need to get her tested again, I was just pondering options if the need arises. We aren't in the US so DYS is not on offer. I've looked into her testing with the WIAT but the availability of this is hard to find here.
We are looking for a grade skip at some point, this is mainly because of the way her school is set up- different sites splitting grades...it's all a bit complicated!

With regard to the SM; she spoke very early and was conversational with us by 18mths of age, but she spoke rarely to other people. This continued, we put the non speaking down to a family history of shyness, though it has come to light that my Grandma was a SM. The issue wasn't helped by several comments made by a teacher within earshot of DD at age 3. This is when she stopped talking, even to us when out in public. At home or in the car she was a different child and words just ran constantly. She's had Speech Therapy for phonological delays- in hindsight she was probably more aware of her pronunciation than everyone thought. She was very much into 'silent participation' when playing with her friends...desperate to talk yet something holding her back.
The therapy is helping; her class teacher has noticed an increase in confidence over the summer break which is just brilliant to hear. She has some good friends that she is now talking with so the small steps she makes are just huge ones for us to see.

Grinity- acting like her classmates is something she does very well albeit silently! I remember her coming home once and telling me she wanted to play Rainbow Fairies and no one understood her so she stopped asking them to play her games. She was 3y1m then and was into reading those Rainbow magic books- none of her friends had even had them read to them by then. Right now her passions involves dinosaurs, rocks, periodic table, Hobbit, Narnia etc, she has learnt not to discuss her interests with her friends. Luckily she is still at the stage of playing races, skipping, jump rope etc with her friends at recess.