I highly doubt she is psychopathic. When I was that age, I was very introverted and UN-RELATEDLY very depressed, didn't know myself well (you're developing and changing a lot and CRAZILY at that age), didn't even know how to really be happy for myself. Didn't have "normal feelings" like "normal peers." I felt emotionally flat, dead inside. People (one of my parents in particular) prying and pushing for me to get "help" and be "normal" only made it worse. Space and time and I found myself (through things that naturally came about in life, connections fostered that were not result of HAVING to connect but through rare emotional connection...I find it's harder for me personally than it is for many others to find someone I actually want to bother to connect with; it's rare, may be why she's so deeply withdrawn... she may just not yet in her considerably very early years have a reason to reach out, but can still happen even in a couple of years). I had to actually physically distance myself from people trying to get at me emotionally: their pressure only shut me down further. Now in my late 20's am more emotionally available, happy, and even stronger in ways than some of my "normal" peers BECAUSE I had space, was pensive, didn't have to be emotionally "accountable" to anyone until I was truly ready.