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Yes and yes. She just thinks she's the smartest person in the room.
Most narcissist think they are smarter than anyone else - ever.
I think the killer saw Travis as her ticket out of grandma's small house and wanted to hang up her apron strings. I think she thought if Travis would take her to Cancun, she could have gotten him to tie the knot. Travis ruined her preying plans and unfortunately suffered a horrific death.