This is certainly tough moment for you. It is good that you can spend good quality time with your son. You should focus on that.
You do not really know what she thinks of you. Do not trust what she does or says.
Not only it is completely useless to "kick her out", but it is actually very harmful. Why would you want to do that? To retaliate for the way she treated you? What good would that do? It is much better to focus on what is best for your son (it is certainly in his best interest that his parents get along well), as well as GAL and detaching.