The Elsa Minifigure from the LEGO Disney Series 2 appears in these sets:
71024 The LEGO Disney Series 2 CMF (Complete Series of 18 Complete Minifigure Sets) (2019)
Queen Elsa of Arendelle (also known as the Snow Queen) is from the Disney movie series Frozen. Officially she is NOT a Disney princess because she is technically a queen. This is the minifigure version, and there is also a mini doll version as well.