The Extended Retard's Return as an Unwanted Child

Stella died in Shinn's arms, her memories of him tragically returning at her last moment, but she was satisfied. Then finds herself reincarnated in a world where she's a known retard and mistreated by everyone but her mother and old servant. As a soldier, she has to adapt and blend in, but with one too many mind-wipes, she's no different from original Lingyue at all...