Maybe you should try taping paper over her "picture window" before you feed next time, since she's so shy. Either that or practice Tai Chi... (slow motion).
You're probably right, that she was kept in a tub previously.

Pre-killing has been the norm for me all along. I had pet rodents before I got into snakes, and don't want either one to suffer. And raising my own rodents
made more sense to me, & then having a ready supply in the freezer followed logically, especially since my "snake family" kept growing.