Ok time to put on my nerd glasses.
🤓
Inklings, in splatoon lore, are actually part human.
This is confirmed in splatoon 3, where a special liquid which absorbed the memories, hopes, and dreams of humans (before they went extinct) spilled into the water and mutated the squids and octopi which basically turned them into a better version of humans
So you aren't exactly wrong, she is PART squid, but there's still a fair amount of human in there