McGrillis starred opposite Academy Award nominee Lesley Manville in the BBC television sitcom Mum as Kelly, the well meaning but dim girlfriend of Manville’s son Jason.[10][11] In February 2019 she played Hannah Wilde in Death in Paradise S8.E8.[12] She later played a grass roots Manchester politician in the third series of Channel 4 Paul Abbott police drama No Offence and in 2020, appeared as ‘Mad Kay’ in BBC sitcom King Gary written by Tom Davis [13] and as 'Sandra' in the Channel 4 drama Deadwater Fell.[14]