Daisycake,
Would return to GP and ask GP for a referral to a developmental paediatrician. Your DD should be seen further by such a person in any event as they can diagnose.
This CAMS form you refer to I am a bit confused about - was GP meaning CAMHS?. Don't also see either why you need to obtain such a form from the HV.
It sounds like she is bottling up all her frustrations of the school day; it sounds like she is just about coping with the rigours of junior school (which can be a tough ol' place in its own right).
Talk to the SENCO too, ask this person for your DD to be seeing the EP as soon as possible.
Re this comment of yours:-
"Everytime i mention anything about autism/aspergers the teachers always say "No way she hasnt got anything like that" for the reasons that she has friends and is sociable and has good eye contact etc".
Sigh. The subjects of ASD/Aspergers/dyslexia/dyspraxia are not widely taught at teacher training college; I would not be taking any notice of any teacher who says that to you. They cannot make such snap judgments, apart from anything else they are not medically qualified to make such pronouncements either.
TBH I'd get the ball rolling myself by applying personally to your LEA to see if they will agree to your DD being statemented particularly if SENCO is using the words "one to one support". Its the only way she'll get one to one. Chances are they will say no but you can appeal their crass decision in the event that happens. You do not need either schools permission or a diagnosis to do this.
www.ipsea.org.uk have model letters you can use.
You are your child's best - AND ONLY - advocate. Never forget this.