Questions & Answers about Hon vill skydda sitt konto.
Because sitt is a reflexive possessive. It refers back to the subject of the sentence, which is hon.
So in Hon vill skydda sitt konto, the meaning is that she wants to protect her own account.
Compare:
- Hon vill skydda sitt konto = she wants to protect her own account
- Hon vill skydda hennes konto = she wants to protect another woman’s account
This is a very common point in Swedish. When the possessor is the same as the subject, Swedish usually uses sin / sitt / sina instead of hans / hennes / deras.