How do you cut off a toxic family member when you live under the same roof?

I'm seriously broke, almost finishing my degree so can't afford to buy a home or even rent.

But how do I just ignore the narcissist's existence in my home?

My goal is to never speak to her as she ruined my life, always abused me, insulted me and criticized me.
I'm alive because of my father who still supported me in some way.

This bitch treated me worse than anything in this world.
How do you cut off a toxic family member when you live under the same roof?
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