Most people are intolerant of addiction. I myself was a non-drug user and cut a number of drinkers and drug users out of my life before I became an addict myself.
The sad truth is that an addict using or in recovery often look the same from the outside. She probably does not know anything about addiction as you point out. If she is not an addict, why would she?
But the upside is that your commitment over time will eventually win her over. Some of those same people I cut out----I late took back in. It took time, but it will happen.