Narrator and point of view

The short story “How to Lose”  by Victoria Patterson is told by a third person limited narrator. The narration is generally presented through Natalie’s perspective, so we get her interpretation of other characters in the story, such as AJ:  

Natalie woke that morning with blood between her thighs and dripping down her legs. Usually she can predict her periods, but her body’s out of whack from the abandoned fertility treatments. AJ wants her to watch him practice holding his breath in the bathtub. (ll. 1-3)

At one point, Natalie is able to directly tell her own, private version of the story, even though no one except herself and the reader can receive it:

There’s an X over the form, but she can still read it:                                                
Are there any personal or physical problems I should know (or conference privately) about?
My sister, AJ’s mother, died last year of an accidenta...