After being sacrificed and brought back to life, Allison started seeing hallucinations of her aunt Kate and grew afraid of them. However, unknown at the time, those visions were presumably warning her that her aunt was still alive. At the end of Season 3, Allison was unfortunately killed by the Oni while trying to save her friends from the nogitsune.
Season 4[]
Kate sought to avenge Allison's death by turning Scott McCall into a Berserker in hopes that his pack would kill him, as she blamed him for killing Allison, though, as Chris Argent reminded her, Allison died saving her friends from the Oni and was not killed by them as she insisted.
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Kate is very delusional, thinking Allison was killed by her own friends. However, Chris makes it abundantly clear that Allison died protecting her friends. If Allison had been around, she would disapprove of her aunt's actions because she loved her pack dearly, as they were her secondary family for her.
It is currently unknown what became of Kate since the series finale. If Kate survived the yellow wolsbane poisoning then she is currently unaware that Allison was resurrected by her friends.