Back again.
Just a few more thoughts on DD3.
If the school are involving an external agency, then your dd3 should be on "School Action Plus" level of SEN. This just means that there are external agencies involved in advising the school.
If support is being provided internally, without involving anyone else, then she should be on "School Action".
With either of these, she should have an Individual education plan (IEP) which should detail 3 or 4 specific targets she's working on, the strategies that will be used to help her achieve these, how these strategies will be delivered and by whom, how the teacher will know when dd has reached them (the success critera), and in what timescale the IEP will be reviewed.
The targets need to be very specific - e.g. "dd will be able to recognise and use the sounds ee, oa, ar and ie when segmenting (sounding out) and blending (joining back together/reading) in reading.
IEPs should be reviewed in short meetings between you and the classteacher (and sometimes the SENCO) at least twice a year. You should have input into the targets and the way they are achieved.
Have I made it sound ridiculously complicated?
Children can move on and off School Action and School Action Plus.
Where do you think your dd's specific reading difficulties lie? Is it in blending and segmenting phonics? Is it with sight vocabulary? What school reading scheme do they use?
What year is dd3?