I think it goes to background and M's formative influences, it also goes to the whole haziness and ambiguity of some of the info we have been given. A college level reader (writer?) at 7, a prolific writer according to mom, artistic but the blog has been surprisingly non-specific as to her grade average, her scholarship achievements. Honestly, that article also gives me the impression that M was a member of that graduating class which doesn't gel with the associate's degree. I have to say I also find M comes across very much younger than 20. That could be partly down to cultural differences since I find a lot of American young people, in some ways, much more 'sheltered' than their Euro counterparts but, even allowing for that, if I didn't know she was 20 I'd say mom was talking of a 15-16 year a lot of the time.