Ovid has it, that Daphne was the daughter of the river Peneus in Thessaly. Others say, that Ladon was the father. So there's a contradiction.
I marked in the genealogical tree that I posted above the position of Daphne with a red circle.
When you look at the original file or the link to that which I gave in the same post it's readable who was involved in her drama (at least due to the author of that marvelous work).
Personally I would lean to your (and Ladon's side) of course and like you say in your last post above here the whole pattern is connected to Eurynome who is (like you said) sadly alive today only in Robert von Ranke-Graves recreation of it ...
In the beginning, Eurynome, the Goddess of All Things, rose naked from Chaos, but found nothing substantial for her feet to rest upon, and therefore divided the sea from the sky, dancing lonely upon its waves. She danced towards the south, and the wind set in motion behind her seemed something new and apart with which to begin a work of creation. Wheeling about, she caught hold of this north wind, rubbed it between her hands, and behold! the great serpent Ophion. Eurynome danced to warm herself, wildly and more wildly, until Ophion, grown lustful, coiled about those divine limbs and was moved to couple with her. Now, the North Wind, who is also called Boreas, fertilizes; which is why mares often turn their hind-quarters to the wind and breed foals without aid of a stallion. So Eurynome was likewise got with child.
Next, she assumed the form of a dove, brooding on the waves and, in due process of time, laid the Universal Egg. At her bidding, Ophion coiled seven times about this egg, until it hatched and split in two. out tumbled all things that exist, her children: sun, moon, planets, stars, the earth with its mountains and rivers, its trees, herbs, and living creatures.
Eurynome and Ophion made their home upon Mount Olympus, where he vexed her by claiming to be the author of the Universe. Forthwith she bruised his head with her heel, kicked out his teeth, and banished him to the dark caves below the earth.
Next, the goddess created the seven planetary powers, setting a Titaness and a Titan over each. Theia and Hyperion for the Sun; Phoebe and Atlas for the Moon; Dione and Crius for the planet Mars; Metis and Coeus for the planet Mercury; Themis and Eurynmedon for the planet Jupiter; Tethys and Oceanus for Venus; Rhea and Cronus for the planet Saturn. But the first man was Pelasgus, ancestor of the Pelasgians; he sprang from the soil of Arcadia, followed by certain others, whom he taught to make huts and feed upon acorns and sew pig-skin tunics such as poor folk still wear in Euboea and Phocis.
"The Pelasgian Creation Myth," from Robert Graves' The Greek Myths, v.I, p. 27: Penguin Books, England, 1955.
As I noted elsewhere to my knowledge this is the model for the original Tarot de Marseille WORLD XXI in motion - so I think that you broke some important ground here - wherever this may lead you.