Which original myths? Those of Hesiod??

Among others. There is absolutely nothing in the original myths that supports Maiden, Mother, Crone. Nor is it evident that all goddesses are really just aspects of a single goddess. In Greek Mythology, you have Aphrodite and Persephone (both of whom would probably fit the "maiden" personality archetype) fighting over a single mortal man (one version even says that Persephone orchestrated said mortal's death so he would be her's forever). Then you have Hera brutally beating Artemis over the head with her own bow (and calling her a hussy before doing it) in
The Iliad. I'm sure that I could find more examples from other pantheons if I had the time. If all of these ladies were really the same goddess than why would she be this self-destructive?
Take a look at chapter 17 in "The Golden Ass" by Apuleius. Surely he was onsite and a member of the worship of a genuine goddess: Isis.
He describes the feminine goddess in all her aspects, including Artemis.
That is straight from the - - - asses mouth

Have you not read that book?
First of all, you can not expect everyone to have read the same books that you have. Second, Apuleius studied Platonist philosophy and was involved with a handful of mystery cults. Both groups tended to believe different things in the population at large.