The premise of this story is simple: someone self-inserts into Naruto, Warring Clan Era, with knowledge of modern medicine. In practice, it's much different from the normal SI stories you may have read.
To start with, the protagonist isn't involved in the "main story" of the current era. She lives in a small rural village, separate from any ninja clan. She can barely use her chakra for most of the story so far. What makes this story so great then, with its lack of ninja battle conflict, is in the charm of the writing, and the characterization of the protagonist. Leading a simple life healing others, furthering medicine, and occasionally meeting with ninja like Hashirama and Madara, who come to her for her great healing knowledge, it's a slow story, with writing you don't often see in fanfiction. Every word is careful and deliberate.
Not the most exciting, but full of charm and its own beauty, it's a worthwhile read.