I am sorry you are dealing with this.

Relationships and friendships have to be reciprocal/ give and take in order to survive. Sadly some people either don’t know how to give or don't care enough. When they need others to listen to their complaints they are first in line, but when they have to show their consideration for others, they just aren’t capable. They are takers. Some people also like to monopolize every conversation and situation and make everything about themselves. They simply aren’t able or willing to comprehend anything that is not about them. They don’t want to bother listening to other people if it’s not about them. They’d only listen briefly if they see that they can grab it and make it about themselves. Otherwise they’d not bother. Then they are surprised why people distance themselves from them and why they have no one left. I am sure you aren’t the only one feeling this way about your friend. That’s likely why people have issues with her

You are within your rights not to maintain this kind of friendship.