Well you found out that talking to her about it is useless....as you already knew before you did....only ends up triggering you more I'm sure because of the stress it caused with her laughing at you.

Since becoming a stronger person to stand up to her will take longer & more work with a T than moving....I would strongly suggest that you put your focus on moving out of there. It will give you some sense of personal control if nothing more than for yourself & it will give you something else to focus on rather than restricting.

When we find ourselves in unhealthy living conditions that we can't change, the only other solution is to GET OUT & at this point it sounds like your only REAL option even though it may take a bit financially before it can be done at least you will have a goal to work toward.