I'm betting on the explanation that either the mother went back in time to protect her daughter or the orphanage was an illusion created by the mother so that MC could grow up. In the case of the second scenario, I have hope, in this world of illusion time really did pass faster, because the white-haired one is probably ML and I would prefer there not to be a 15-year difference between them.
The white haired dude is putting a wrench in all of my theories, cause he a grown ass man. Ain't no way she's gonna stay a kid if he's going to be the ml. But it doesn't make sense either if she ain't a kid cause she's most likely the child in the countess's belly when she died. And I want her to stay a kid.
so i was thinking that she is the real daughter but the age didn’t make any sense bc she would be 5 but she’s 20, then i thought ‘so the mother was a fairy too and after she got pregnant she went back in time and gave birth?’ and somehow the father kinda knows about her and that’s why he have been looking for her? and my other conclusion was that she was the wife