Jennie is a What's On Stage Award nominated actress.
In the West End, Jennie has been seen in Elf (Dominion Theatre), The Pajama Game (Shaftesbury Theatre), Sister Act (London Palladium), The Lord of the Rings (Theatre Royal Drury Lane), Mary Poppins (Prince Edward Theatre), Jerry Springer the Opera (Cambridge Theatre), Les Misérables (Palace Theatre), The Witches of Eastwick (Theatre Royal Drury Lane) and Scrooge (Dominion Theatre). Her numerous other credits include productions at Chichester Festival Theatre, Regent's Park Open Air Theatre, Hackney Empire, and Théatre du Châtalet.
On television, Jennie has appeared in Victoria Wood's What Larks! and Midlife Christmas, Midsomer Murders, and The Tracey Ullman Show.
Jennie plays Captain Captain in the hit CBeebies show Swashbuckle, and over Christmas 2019, starred as the Witch in the televised CBeebies pantomime Hansel & Gretel, which was also shown in cinemas across the UK.