I've seen something similar done in "Lycidas" by a german author called Christoph Marzi. I am not sure if it is translated yet, or if they are planning to, but if you have the chance, read it, it is great.
Anyhow, one interesting thing is, that the pov character is the mentor of the main character, so you are looking at the main character from a third person view, but the story is told from the first person view of the mentor. Sort of the opposite of what you are doing, but it kind of does the same. you are focused on the main character, but since you see her from the mentors pov, you get the comments and interpretation of her actions as the mentor sees it.