I sort of remember something like that...
However, and obviously we have no way of knowing at this point, being a special education student does not preclude you from being on the honor roll in most schools, and, in fact, can help you get there which bothers many people...
Not to get too far o/t but special ed students have Individual Education Plans with accommodations and modifications, which can and usually do, in my experience, include grading accommodations...so, in fact, what an A or B may represent can be progress toward a goal, or accomplishment of an IEP goal...
Anyway, as I said, we really don't know and as far as I'm concerned if she were developmentally delayed in any way it would just be one more factor in the vulnerability of her position in the household and in society in general (if that makes sense)...