A confirmation of my guess that Iphegenia=Anoubis comes from Hesiod's Catalogue of Women (fr. 19, tr. Glenn Most):

Because of her beauty Agamemnon, lord of men, married
Tyndareus' daughter, dark-eyed Clytemestra;
she bore beautiful-ankled Iphimede in the halls
and Electra who contended in beauty with the immortal goddesses.
The well-greaved Achaeans sacrificed Iphimede
on the altar of golden-spindled noisy Artemis
on the day when they were sailing on boats to Troy
to wreak vengeance for the beautiful-ankled Argive woman—
a phantom: herself, the deer-shooting Arrow-shooter
had very easily saved, and lovely ambrosia
she dripped onto her head, so that her flesh would be steadfast forever,
and she made her immortal and ageless all her days.
Now the tribes of human beings on the earth call her
Artemis by the Road [=Hekate], temple-servant of the glorious Arrow-shooter.
As the last one in the halls, dark-eyed Clytemestra,
overpowered by Agamemnon, bore godly Orestes,
who when he reached puberty took vengeance on his
fathers murderer, and he killed his own man-destroying mother with the
pitiless bronze.

Hekate is the exact equivalent of Anoubis in the Demeter myth. The sacrifice on the altar surely mirrors the exposure of Anoubis as an infant.