It’s vital that you consider the role of Illyria itself.

Viola thinks about her brother's death when she lands on Illyria's shores, And what should I   in Illyria? / My brother he is in   (I.2.3–4)

Ask yourself: To what extent does Viola think of Illyria as a place where she can separate herself from the fate of her brother, or is this comment meant to suggest that Illyria is a kind of mythical, dream-like place?