Leaity was raised in Southampton. In 2011, she was awarded a place at the National Youth Theatre and then studied at the Royal Academy of Dramatic Art.
Leaity starred in a two part episode of Lewis in 2013 and then an episode of Breathless. She then starred in the short film Etiquette.
In 2014, Leaity starred in three episodes of Mr Selfridge as Gabriella and an episode of Endeavour in 2016.