L.C.
Contact the EI coordinator. Tell her that you make time every week for this important therapy. Tell her that you understand that people get sick, but to cancel when they are due to walk in the door is unacceptable.
I used to take my son to the school for his speech therapy. We had a schedule and we stuck to it. It never varied -- ever. If his therapist was out sick, the other would cover.
LBC