All those are reasons to give the church some elbow room but they are not reasons for actually staying. I'm on the same page as you. Finally, it is a very tight-knit community and despite efforts to insulate you from conversion-minded missionaries, you will be exposed to a lot of people that think, like this woman does, that atheists are without a moral compass.
Honestly, I don't have very good advice, but keep being you and hopefully she won't let her religion blind her like it blinded me.
Probably, not Mount Meadows level, but be prepared to have to apologize on her behalf a lot.