We went for the follow-up meeting at the sensory integration clinic and met with the occupational therapist (OT) who did Ainsley's evaluation. She concluded that Ainsley does indeed have Sensory Integration Disorder (SID) - specifically, she has difficulty processing signals from her vestibular system, the system that is related to balance and spatial orientation. Basically, she can't control her body really well and it makes her frustrated, which can cause emotional outbursts and has caused her to avoid doing certain things that require a lot of coordination and balance.
We - my husband, and my sister-in-law (the counselor) and I - agreed with the therapist's observations and not much of what she said was a surprise. In fact, most of the things she pointed out were things we had noticed in our own interaction with Ainsley.
So, we're going to start OT sessions twice a week. The therapist was very optimistic that the sessions would help Ainsley improve her coordination, balance, and spatial orientation enough to where she would be able to feel comfortable engaging in more complex physical activities. I am excited because I think these sessions may encourage Ainsley to become more physically active - right now she doesn't like to play on playgrounds or do other physical things like that too much. I always like having a "game plan" so I am glad we're done with the evaluation phase and can finally move on to the treatment phase.