In 2015 Bruni performed in Donkey Heart and the one woman show Before You Were Born, both by Moses Raine, directed by Nina Raine at the Trafalgar Studios. In 2016, she starred in the Steven Berkoff double bill Lunch and The Bow of Ulysses (Trafalgar Studios), directed by Nigel Harman. The following year, Bruni appeared as Goneril in a production of King Lear in the Globe Theatre.