Maddy trained at Rose Bruford College.

She played the hugely popular Nancy Carter in EastEnders for three years, for which she won Best Newcomer at the National Television Awards 2015 and Best Newcomer at the British Soap Awards 2014, as well as being nominated for Best Newcomer at the TV Choice Awards 2014. She reprised her much-loved role in 2021-22.

Maddy’s stage credits include A Midsummer Night’s Dream at the Southwark Playhouse and the title role in Matthew Dunster’s Imogen at Shakespeare’s Globe.

In 2021 Maddy featured in two acclaimed short films, Enjoy by Saul Abraham, and Run by Emma Miranda Moore. She recently completed shooting on Santiago in Portugal.