Can depression be turned outward?

So I've heard that depression described as anger turned inward, but can the opposite effect still be depression. My mother has suffered from it for some time, but I've never been sure if it's purely cirstantial or clinical because she is one of the angriest people I've ever known. She does have her moments where she is melancholic, but she blames everyone else for her problems. She never takes responsibility for the things she's done wrong, and she has little regard for the way she treats other people, but is incredibly sensitive to other people slighting her, even if she provoked it. I've also struggled with depression since I entered my teens, and growing sometimes she would be blame me for her feelings of depression because she thought I was infecting her with them. She can be incredibly selfless and very loving, but she can also be emotionally abusive and almost violently angry. She's never struck him as a typical sufferer of depression. I've never trusted her to visit therapists because she has a victim complex and will lie compulsively(usually to make herself look better). And when she isn't, she manages to be very histrionic. I'm not exactly sure what she has.