Your probably right since she has both demon and holy powers in her it may differ. Either she lives a long time like her father or has a shprt life span like her mother, maybe its a combination of both and shes somewhere in the middle
the possibly of her goddess power awakening (I think there's a possibility of her 1st life was a goddess) and her becoming immortal again. they mentioned her existence wasn't normal due to the contrast in powers of light and dark destroying themselves... they repel each other so it was mentioned her still existing was to be seen as a miracle.
So can someone tell me rins life span in this world? Because that dragon is 449 year old so rin might too be able to live that much?