Responses
i think it's this
https://www.mangago.me/read-manga/how_to_protect_the_heroine_s_brother/
might be this as well !
https://www.mangago.me/read-manga/the_princess_pretends_to_be_crazy/
The fl is a princess she has multiple siblings and they're all fighting each other i dont remember why but I think its for the throne so basically to avoid being killed she acts crazy delusional and out of her mind till one day something happens and she finds herself with a super strong magician or something I can't remember anything also I think she has blond hair (not sure)