。
She gets up late on Sunday mornings.
Literal
She [topic-は] Sunday's morning [topic-は] late get-up.
Two は in one sentence — 彼女は (the main topic) and Sunday's-morning-は (a smaller, contrastive topic). The second は contrasts Sunday with other days: 'as for Sunday mornings, [she gets up late] (unlike other mornings).' This stacking of は is common when restricting a generalization to a particular sub-domain.