Why would an author choose a third-person narrator?

A third-person point of view can be omniscient, in which the narrator knows all of the thoughts and feelings of all of the characters in the story, or it can be limited. If it's limited, the narrator only relates his or her own thoughts, feelings, and knowledge of various situations and other characters.

hope this helps ;)

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and also the mystery girl it might be someone that she might know in her school

glitch or non-saved account.

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i'm not personally a mobile user but one reason could be that it is either a glitch where it doesn't automatically log you in, or you have it so cant save your log-in information. i suggest you use the mobile app instead of using your web browser!