Danzai Sareru Koushaku Reijou, Umarekawatte Last Boss no Ouhi-sama no Kodomo ni Narimasu

I was supposed to be an ordinary working adult, but I was abused by my stepmother and turned into a little girl on the verge of death from starvation. Apparently, I've been reincarnated into the world of a novel as Lilia, the villainous young lady who is wrongly condemned. But now that I've remembered my past life, things won't go as planned. To start with, I escaped from my confinement room and sought help from Queen Hilbert, the final boss of this world, but the result was unexpected—!? A fantasy of rising from a condemned little girl to the adopted daughter of the final boss!

(Source: Kodansha, translated)