A big X to all of the bitches

Here is a social phenomenon. You have a so called friend but she's an idiot. But what can you do? You work together. You support through the stupid  problems she has in life, you go to her house to keep her company even though you have better stuff you can do, because she can't go in a lot of places with her young children, you listen every idiotic word comes out of her mouth and bare with every second of nagging when you work, you listen to her money and family problems with her cousin and mother and blah blah blah, she never asks how YOU are doing and what are your stupid problems as every woman has some. Her IQ is like 70.
Suddenly, her cousin gives her work in the cafe-bar she owns, they get along sooooo good, they're best friends all of a sudden, they get involved in a Ponzi scheme, she goes trips to Europe through that with her husband and cousin and a whole bunch of new friends, children left back home with their grandmother, she pretends she doesn't see you when you go for coffee at the cafe she works and she never calls you but just this once to get you, with the help of her bitchy cousin, in the Ponzi scheme and earn money from you, without telling you what this is about, just telling you to come home and drink some coffee. Her IQ dropped from 70 to 50. Hopeless case.
What do you do?