8. The problems of Albertine are (from the narrator's point of view)
a) lying
b) lesbianism
and (from Albertine's point of view)
a) being imprisoned in the narrator's house.
9. Her bad taste in music, although several times remarked on, is not a problem.
10. Albertine does not call the narrator by his name anywhere in the novel. Nor does anyone else. The narrator hints that his first name might be the same first name as that of the author of the novel, i.e. Marcel. Let's go with that.
11. Albertine denies she is a lesbian when Marcel questions her.
12. Her friends are all lesbians.
13. Her denials fascinate him.
14. Her friends fascinate him too, especially by their contrast with his friends, who are gay but very closeted. Her friends "parade themselves" at the beach and kiss in restaurants.
15. Despite intense and assiduous questioning, Marcel cannot discover what exactly it is that women do together ("this palpitating specificity of female pleasure").
16. Albertine says she does not know.