Pretty peasant girl

A 35 year old female doctor, Su Xin Yu got isekai-ed into another world, when she woke up, she was in a child's body, she hid this secret as she grew up, while trying to survive in this gender discrimination world, Xiang Zhi became best friends with a boy named Shi Tou brought by a mysterious man, while not knowingly, she showed her skills and ideas which far exceeded what a child was capable of, a skilled mysterious old lady in the village noticed…