there is a thread in the psychotherapy forums going on right now about books about therapists/therapy. you might find some useful suggestions there?

apart from that however, i remember i mainly read fiction through high school, so read a lot of books along the lines of "girl, interrupted", "the virgin suicides", "one flew over the cuckoo's nest" etc. not that "educational", per se, but great for developing awareness and empathy. i am sure we had to study one for high school english, also.

i also read the DSM-III from cover to cover, but i was a bit weird like that.

the other thing if she is interested is maybe getting work experience in a clinic somewhere? i was lucky enough to be given the opportunity to spend a week's work experience in a inpatient house for severely distressed children & adolescents, and it was a turning point in me actually commiting to study psychology further.