Hi ArchDemon welcome to the forum. I am presuming your friend is a witness as well as the mother.
JWs will disfellowship any baptised person who disagree with their faith and who show know repentance after being spoken to.
As far as doctrines go they are constantly changing them. As soon as something they say is proved wrong the leaders change it and all witnesses must conform to the new understanding or be disfellowshipped.
It is good you did some research about them. Many people are able to do that now especially with the power of the internet showing what they are really like.
If you want to keep her as a friend you will have to keep most of your thoughts to yourself, because witnesses do not like any critisism of their organisation.
Good luck