"any attempt to get her tone it down will sound like a direct attack on her religion from her perspective"

I grew up being told this. And it didn't take me that long to realize that the people teaching me our then-shared religion were making a deliberate choice to view being asked to tone it down as a Direct Religious Attack.

This situation reminds me of the adage "your right to swing your fist ends just before where my nose begins." Sister forcing other people to participate in her religion with her (as Trying To COnvert People is one of her religious practices) is over the nose line, I think.