I had issues being scared of my STBXW (still do TBH, though not as much as before). I realized that, for me, it's mostly not rational, that I had been somehow "programmed" by her to fear her. Once I started to acknowledge when it was happening, I started to do better with it.
I suggest you spend some time thinking why you're scared of her. What will she do? What COULD she do?
Me-47,XW-43 S13,S16 M:18 BD:4-23-17 W filed:7-17-17 (5 months of in-house separation hell) W moved out:1-6-18 D granted:2-15-18 Decree signed:3-29-18