Confusion on getting Rare Tasha

Can anyone explain when this vendor reset. It never sells rare tasha. Have been reading severel places about it and noone seems to be able to get her. Is she maybe removed since for weeks looking and she dosnt show up.
When does vendor rest is it one time a week or everyday. I have done the Unas there and still no Tasha.
Im open for feedback on how to get this one. The game needs to have some sort of time on the vendor to see when it resets, like the merc ships have. It waste of time going to that island over and over with no result.

ps. Update found it on Atropos island, the vendor there had it today. But still to confused players a timer on this would be nice to know.

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Was at Slime Island today. First time ive seen it.