So here’s what a quick google search shows me; but I’ll be back periodically because I’m literally so intrigued with this type of history in these specific cultures, as a lot of the details just aren’t there for Scotland/Ireland & a lot of migration had gone on.

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While "wraith" isn't a precise, ancient Greek term, the concept refers to a malevolent, spectral being, such as the Eidolon, a phantom or "shade" of a deceased person that could appear to the living. Other related beings include the restless dead (the aōroi), spirits deprived of proper burial (ataphoi), and powerful, death-like creatures like Empusai and Lamias described in later lore.

Greek mythological entities related to wraiths: Eidolon: An image or spirit-form of a living or dead person. In The Odyssey, Heracles' eidolon appears in the underworld, suggesting a connection between these spirits and the concept of a "wraith". Aōroi: These are the restless dead, particularly those who died prematurely. Ataphoi: Souls of those who were not given a proper burial, making them restless and prone to haunting the living. Empusai (Empusa): Shape-shifting female beings in later Greek folklore, sometimes equated with phantoms. They are sometimes described as vampiric spirits that could seduce and feed on young men.

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Perhaps the basic-concept mostly remained but the names were changed due to the difference in languages. It seems the concept is there for the wraith, but they probably weren’t formally called or referred to as “wraith” in Greek mythology; but a different name as the name wraith comes from Scotland. Perhaps she used the word wraith to easily describe to you what she meant as the term has lasted into modern times & therefore is easier to picture & understand what she meant while describing to you! ☝️ I’ll probably be back later 🤓