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I only saw an initial story when this all first kicked up, and the mugshot of her definitely looked like she was either high as shit, or experiencing some kind of mental break.
Can’t say the article posted here sheds any further insight.
As you said hopefully any other responsible party is identified and held accountable. Just feels like she’s been set up to take the fall.
She kills a guy (and admits doing so to the cops!?!), somehow dumps his body into a burning fire pit, and then ... goes to sleep?!?!?
That's cold af. >

It's weird. She claims she doesn't know the guy, but he takes an Uber to her house. Then she says he was beating her so she stabbed him. There's a trail of blood in the front yard leading to a car (I presume it's hers?) and the neighbors didn't hear a thing. Oh, and the woman dragged his body back in the house and out the back door to a fire pit And took a mattress from the house and set it all on fire. Yet the neighbors didn't see or hear anything? I'm genuinely puzzled. >

It smacks of an additional party being involved, or Meth. >

I read another article that had the accused’s mug shot and statements about her insinuating she has a history of mental health problems. 
It sounds like a bad deal all around. I hope the authorities find everyone involved and whoever is responsible gets the help they need. As well as the parents and friends of the victim.