Pretty peasant girl

A 35-year-old female doctor, Su Xin Yu got isekai-ed into another world,

and when she woke up she was in a child’s body.
She hid this secret as she grew up. and tried to survive in this gender discrimination world. Eventually, Xiang Zhi became best friends with a boy named Shi Tou who was brought by a mysterious man and unknowingly showed her skills and ideas which far exceeded what a normal child was capable of.
And then a skilled mysterious old lady in the village noticed…