What is so confusing here is if Hecate was seen as a daughter of minor parents such as Perses and Asteria, why would Zeus "give" Her so much power and ruler of Earth, Heaven and the Underworld, and He favored Her above all. Of the three most likely roles for Hecate when she is found at entranceways, the evidence best supports that of guardian against outside dangers. Laughing she said "Nothing much Apollo, there is a war going on in the magical world and I'm trying to find a way to destroy the terrorist who is killing magicals and non-magicals alike. Perhaps during the Matriarchal times, the Crone was recognized for Her wisdom and She was respected until the warring Solar Gods with their sexual prowlness came and took the powers away from the Goddess, and the Crone was cast away to die in some hidden cave.Homer’s Hymn to Demeter, the earliest account of the abduction of Persephone by Hades, dates to the late seventh or early sixth century. Hecate and Helios are the only witnesses to Kore’s (Persephone) kidnapping, and they inform Demeter what has happened...first by Hecate and then by Helios. 'Hecate' is the female equivalent of 'Hekatos', an obscure epithet of Apollo, with whom She is sometimes associated. However, Hecate’s grandmother is Phoebe, the Moon. On the one hand, Hecate is shown as very supportive of the two Goddesses: She brings news to Demeter, accompanies her when she seeks more information from Helios and repeatedly embraces Persephone upon her return. Or, more emphasis was put on Demeter, thereby leaving Hecate as secondary, which contradicts what other scholars have said; i.e., that "It is noteworthy to mention that in Homer’s Hymn to Demeter is the connection between Hecate and Helios. Eurybia is the sister to Phorkys who Hecate who later bears the female Sea-Monster Skylla). In Hesiod’s poem, roughly in the midpoint of the poem, is material describing the birth, history, powers and spheres of influence of Hecate. Hecate's History and Origins Hecate’s History and origin is a very complex one for even though Hecate is considered to be a powerful Goddess and a Goddess for the people; there is not much written information about Her as She does not have much involvement in mythology nor does She have much interaction with other Deities. However, a Goddess who is associated with magick and She gets a negative image!  Literature has it that Medeia evoked Hecate and performed magick regarding women's issues and this reflects Hecate’s role, once again, as the benefactor of this magick as evidence for Her being a The prominence of Hecate Chthonia in later literature is probably the most difficult to explain. Women predominate in artistic and literary representations of mourning and the laying out of bodies; laws were passed governing their actions and influences of funerals. Rhea married Krones, to whom she bore three daughters and three sons, the Great Goddess Hestia, Demeter and Hera and the great Gods Hades, Poseidon and Zeus. Plus a few passages of Sophokles evokes a very clear picture of Hecate that Her torches seem to pair her specifically with Helios, the Sun God. She was never portrayed as the Crone, and you have to wonder why. Sacrificial meals are commonly left out at crossroads for Hecate, especially during the Hecate is also associated with dogs, and dogs, as well as Hecate, are credited with excellent night vision. You had mergers where treasury of the league was moved to the Acroipolis from Delos, where Artemis was prominent. Helios, on the other hand shows little compassion whatsoever. Hecate is a third-generation Titaness born to Perses and Asteria, daughter of Koios and the Oracle Phoebe. Her name means "will" but at the same time, but her name's spelling and pronunciation mean that "operates from afar", "removes" or "drives of", "the far-reaching one" or "the far-darter". Only a few deities are well documented in literature and Hecate is one of the many who are largely absent, especially before the fourth century.  Also....one has to bear in mind that there is only so much factual information out there from paintings, plates, the Hymns, etc., regarding the Goddess Hecate and the rest of the written material is merely speculation and should be taken as such. For instance, the mention that Hecate had many children. There is only one factual evidence in which Hecate may have had one child, Skylla, and it was not from Hermes but from Porkys.  I have read some sources state that Hecate had many children and some with Hermes which is mere speculation with no evidence. In fact, the only association Hecate has with Hermes are their roles as chthonic Deities and/or guardians of the common people. For those reasons above, I am careful in what I believe to be information on Hecate or any other Deity for that matter and I tend to take more to heart on what scholars have to write than anything else.. Anyone can write a book but the difference is between whether it is factual or mere speculation on the author's part. Hecate is an ancient Goddess from an earlier pre-Greek strata of myth. So, according to Hesiod, Hecate is therefore the cousin of Apollo and Artemis.
When Hecate appears as a companion, it is with the innocent daughter of Demeter.