One daughter attended a small high school that did not have any AP classes at all. She still got into every university that she applied to with merit aid from most of them. It is common that small schools do not offer AP classes for the simple reason that there would be too few students to take them.
A small school has some significant advantages. One is that you get to know your teachers.
I do not know the school that you are going to at all. However, at first glance this does not seem crazy.