I thought Holo left because the others in her pack treated her like she was "holy", and she didn't feel like she had any genuine friends? That's her rationale for going off on her own, she "wanted a friend", and she eventually found one in Pasloe.
I'm guessing that Paro and the others are her packmates, and not at her level.. but demigods nonetheless, because she still expects to reunite with them hundreds of years later.
But in Volume 4, it becomes clear that: