Your daughter sounds much like my 15-yr-old niece. We recently gained legal custody and had complete neuropsychological examinations and testing done, which showed she is at Level 2/Level II on the Autism diagnosis scale and also has intellectual and socio-emotional issues. What made her previous guardians unaware of her learning challenges was the fact that she has eidetic memory, and recalls everything she sees, experiences, hears or smells. She also has no concept of time or of passing time, enjoys a lively fantasy world, and gets excellent grades in school (although definitely learning disabled). She memorizes data, but has no functional abilities to use the data in any manner other than repetition.