Hello, I went through your query, her grades in school, and your description of, her being creative and good sense of humor suggests, she is above the average of same age children. Coming to learning, speed of reading or learning varies widely among children or adults, simply pressuring them for higher grades induces stress and results in negative results. No need to worry about previous injury, it is not significant now, Consult neurologist if she had any episode of fits, other wise please don't worry, be happy.