Responses
https://www.mangago.zone/read-manga/it_s_my_destiny_to_be_the_hero_s_saviour/
I’m pretty sure it’s this one :)
It is! Thank you so much!
Her father abuses/experiments on her until she ran away to her grandfather who is a mage(?) Archmage or something that's all I remember, medieval theme, blonde hair! (Atleast I think.)