Hi
I am a UK born and trained conductor (although not currently working in the UK) - so obviously I am biased!
CE can be hugely effective for children and adults with CP (and many other neurologically based movement problems) and I have seen many children benefit from it. Full time, whole day programmes in groups are the most effective way to deliver it but you can get good success out of sessional (e.g. one day a week) or intensive short term (e.g. the 4 week program that you have mentioned). Using a conductor as an au pair can also work and is good for working out things to do at home - I would suggest attending this 4 week program as well though.
It is hard work for the children as they are encouraged to move a great deal and make a lot of effort - however it should always be fun and engaging and very much done through play, especially at your child's age.
CE is about teaching skills that the children can use every day and these skills can be anything and everything, from sitting to walking to self care to communication etc. We look at the child as an individual and will work out what their next steps are and tailor everything around that. CE has always been 'holistic' in that it looks at the whole child, from top to bottom, inside and out. CE is about personality, confidence, self-belief and independence as much as the obvious physical side.
I am not sure what you mean about it valuing function over form - although we teach practical functional skills, the way in which the child performs them (and especially things like posture) is also very important.
If you want to advertise for a Conductor au-pair, you can use this Facebook page:
www.facebook.com/pages/CONDUCTIVE-WORLD-JOBS/376055890606
I hope that you find Conductive Education useful and the best of luck to you and your daughter. Please feel free to contact me if you have any other questions.
Regards
Ben