Hey /adv sooo there's this long complicated backstory involved

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Hey /adv
sooo there's this long complicated backstory involved in all this but let me summarize:
sister's ex-best-weeaboo-friend from middle school lives with my hoarder parents who let her sit on the couch ALL DAY (she only gets up to make food, use the bathroom, or walk to taco bell/7-11). She lives like a filthy sewer rat. She never showers. She never brushes her teeth. She does not clean the mold that must be growing between her blobbish thighs. She doesn't have a job (welfare pile of trash), she doesn't do any chores unless forced to (my mom pays her to do the dishes everyday and she complains about that), and she has a negative attitude about everything. She smells like melted crayons, fifteen day old fish left out in the sun, and stale artificial cheese sauce. She wears the same clothes for days and I see crusted blood streaked along the back of her skirt. Honestly she's probably a health hazard.

I just moved back in with my parents, have a rad job delivering pizzas, and am close to finishing a bachelor's degree.

should I confront The Blob (as I've come to know her as) and try to scare her into straightening her life out or.. should I ignore it until I have enough money to move out? I don't know how many more fantasies about setting her on fire I can take.
She's disgusting and talks shit at her friends on the internet in a fake english accent. She's obviously mentally deranged from a lack of real-life social interactions.
I caught her today yelling at someone on her psp about being a slut and betraying her, all in a Jon Snow accent. The last straw was when she called my cat a turd.
What would you do?