I never really got the feeling she cared about me at all. I told myself that I must be being over sensitive but with how cold and abrupt everything ended, I think I was right.

I think this is the wrong conclusion to reach. as skies said. I suspect her manner was entirely about her professional life; she may have been assigned to you, and knew she would be leaving but for professional reasons couldn't reveal that, so only acted to try to keep you stable in the short run, but not engage with you. Don't take responsibility for this, nor assume it reflects on you in any way.