One step at a time
Isis predates the Sumerian civilisation and the egyptian one
Sumer didn't happen until later
in hathors case the earliest depictions show her depicted as a water buffalo either side of the kings cartouche and shes heavily connected with the Egyptian Zodiac
Which is odd because at the time she is depicted on the Narmer pallette water buffalos didn't exist in egypt and they didn't know anything about the Zodiac
funnily enough though water buffalos are commonly depicted in sumer either side of the box containing the kings name
And the Zodiac originated in Sumeria
but they had 18 houses not the later far inferior 12
but of course seeing as most egyptologists won't touch the sumerian culture with a bargepole they can go on living in ignorant bliss