If the Maidens are all from one bloodline since her ancestors date back to the ones who first defiled the mountain, and Soh is the previous Maiden...she must be related to Yoshiro. If she's from the previous generation, is she an aunt maybe?
It adds dimension to why Soh is affectionate towards her as Yoshiro would be a family member she never met when she was alive.
But...Soh can't be the only one to have been affectionate to their Maiden.
Was Soh really the only one to want to stop the cycle? After 7 cycles?
Here's Soh photobombing as Amaterasu.
