People are complaining that the MC is a mary sue. They seem to forget that she went through two lifetimes in different worlds. In this world she was groomed to be queen and lived through the current events. In her next life she was a surgeon, who are known for being innovative, critical thinkers, determined, smart and resourceful. So how is she a mary sue, if she paid her dues and put in the time (two lifetimes)? She's not using some special system, she wasn't paired with some goldly creature or given supernatural abilities, she's using her smarts and knowledge from past lives to her benefit. Plus, even with that, she's still lacking in some areas, and perhaps a little bit too naive for being on her 3rd life. It's always with the female characters that people complain, you never heard them complain when Naruto, Luffy or Goku reached ridiculous power levels or had abilities that were the biggest plot armors in the story. Compared to other reincarnation novels, this one is more grounded. They could've easily given her magic (like the royal family) and have her be OP, but instead they had resolve issues within the scope of her knowledge and experience (actual character growth).