I hate enablers. I know how you feel inapsin. My wife's cousin is the same way. She isn't divorced, hell she doesn't even have a boyfriend, but now that my wife is "out" they are partners in crime. THere is nothing that she won't encourage.
There is nothing i can do about it, except detach.
It sucks. There are only 2 outcomes. 1 she will realize that not everything they say is right. 2 she will be stupid and continue down that path.
As hard as it is, we all have to accept the second choice and pray for the first.