Well, psychotherapy is really just a general term for various kinds of therapeutic approaches. Take a look at this wikipedia link for instance
http://en.wikipedia.org/wiki/List_of_psychotherapies
Did she say exactly what type of psychotherapy she wanted you to start? I mean, right now I'm probably in "psychotherapy", but it's just me talking to my therapist. I think overall, as a general term, it doesn't really mean anything beyond "therapy".
Hope this helps.