She sounds insecure, hopelessly calling out how badly some people treat her, while doing the same thing to others. She doesn't sound established.

From my experience, people who complain about other people's behaviors are likely to behave like them, because instead of understanding this kind of behavior hurts, they rant about it, yet because of insecurity they wonder if this is the way to treat people back.

I knew a woman who once ignored my message, and later responded "Sorry for not responding, it's just that other people have been this way to me so it has influenced me".

I suggest not investing energies in feeling sorry for her, because from my experience those type of people who are uncertain about their types of peers are more likely to contact people to experiment or compromise rather than be truly interested in them.