Isla Gie. Actress: Sandman. Isla Gie is a British actress represented by Curtis Brown. In 2018, at the age of 7, Isla made her professional debut in the Cameron Mackintosh production of Les Miserables (UK and Ireland tour) as young Eponine and then as Little Cosette. The following year at the age of 8, Isla played the lead role of Cindy Lou Who in Dr Seuss' How The Grinch Stole Christmas...