Resolved MC is the maid and she is helping the novel's villianess

I was reading this novel some while ago but I forgot the title. Can someone please help me..

So the mc was reincarnated into a fantasy world where she passes her days working at an inn. There she learns about some noble paying more salary or working conditions...I don't remember so she goes to work there. And she learns that the world was a book from novel and she is now working as the maid in that novel's villianess family. That villianess now is actually a child and been locked up in a tower by her uncle. And she is just so pitiful. So our mc helps her.
Also she plans this amazing revenge on the uncle bastard and now she is her legal guardian.

That's pretty most of it from what I remember.

 

Please be my Heroine or something

Edit
My Lady, Please Become My Heroine!

 

Got it. Thanks. ")