To entertain. The books are literally a fantasy series. I suppose it also helped her through her depression and such, but her actual purpose was to entertain and teach some morals suck as the importance of friendship.
i think its the first one because having n adult around is good but not always effective and having no friends makes no sense. i guess the last one makes sense but its not very relivant to the question so-
The answer would be 2.) because it does not include my or our.