The website sensory-processing-disorder.com has a database of qualified occupational therapists as well as a very helpful step-by-step guide for helping your child who potentially has sensory processing issues get the help they need. It is a very helpful, although somewhat overwhelming, website with a lot of useful information.

In my opinion, I would wait as well. My older children are in Foundations and my four year old dd very easily memorizes right alongside her brothers at home. However, I will wait to enroll her in Foundations until she is five or six simply because it is three hours spent in a classroom. If you are really interested in getting a start, I would recommend buying a CC memory work CD and play it in the car, while she plays, etc. It is amazing what they are able to store away without sitting for an extended time in a classroom at such a young age. And although CC can provide a good community and relationship building opportunity, at this age, you can accomplish the same thing through a playgroup, MOPS or other more age appropriate venue. IMHO.