Gennie is a freelance clarinettist and bass clarinettist who has performed at venues such as the Wigmore Hall, Ronnie Scott's Jazz Club, Kings Place, the National Maritime Museum in Greenwich, St John's Smith Square and Camp Bestival. In January 2015 she was appointed as Principal Bass Clarinet of the Orchestra of the City; she has also played with the New London Chamber Ensemble, Vanbrugh Ensemble, Corinthian Chamber Orchestra, Blaze Ensemble, University of London Symphony Orchestra, London Graduate Orchestra, London Repertoire Orchestra, Lambeth Orchestra, Ernest Read Symphony Orchestra, Arioso Orchestra, City of London Symphonic Winds, The Collaborative Orchestra, Fulham Opera, Orchestra Vitae, Blackheath Halls Orchestra, Morley Chamber Orchestra, Docklands Sinfonia, Amati Orchestra and South East Youth Symphony Orchestra.

A passionate chamber musician, Gennie is the bass clarinettist in Engines Orchestra, who have recorded their debut album Lifecycles which was launched in November 2014 at the London Jazz Festival, as well as performing at venues including Ronnie Scott's Jazz Club and the Scarborough Jazz Festival. Gennie also played bass clarinet in the seven piece band A'ime, active in 2013, performing at such venues as Ronnie Scott's Jazz Club, Bermondsey Antiques market, and The Roxy Bar and Screen, Borough.

As a soloist, Gennie's performance work to date includes solo bass clarinet recitals at St Alfege, St Andrew-by-the-Wardrobe, St Paul's Church in Bedford and The Pound Arts Centre in Corsham. In February 2014 she gave the European Premiere of the Jazz Set bass clarinet duo by William Smith, with Harry Cameron-Penny, and the World Premiere of the 'Dance of the Green Witch' bass clarinet quartet by Paul Harvey, with the Appleton Clarinet Quartet. As well as this, Gennie also gave a solo performance in a bass clarinets recital at Trinity Laban Conservatoire of Music and Dance in February 2013. Whilst at the University of Nottingham, Gennie gave five solo recitals including both clarinet and bass clarinet repertoire in Djanogly Recital Hall, Nottingham. Her recording experience covers a New Music Recording Session with Mike Purton, Naxos recording producer, session recording with Larp Music LTD, and clarinet and bass clarinet in the soundtrack for choreographed film 'Chronogracy' (2012).

Gennie completed her postgraduate performance studies at Trinity Laban Conservatoire of Music and Dance under Ian Mitchell, Hale Hambleton and Joan Lluna, where she was awarded a Trinity College London Scholarship for her final year. Whilst studying at Trinity Laban, she performed with the Trinity Laban Symphony Orchestra, Wren Ensemble, Wind Orchestra, Repertoire Orchestra and String Ensemble. Whilst completing her undergraduate music degree at The University of Nottingham, she performed with the University's Philharmonia, Sinfonia and Wind Orchestra.

Gennie is also a freelance teacher, currently working for Southwark Music Service, Barking and Dagenham Community Music Service and Music in Offices, as well as working as an early years music workshop leader for Boppin' Bunnies and Stretto Music. She has also worked for a range of education projects, including work with London Philharmonic Orchestra FunHarmonics and Animate Orchestra, Mint Street Music Festival, Creative Club at Stratford Arts Trust, Tea Dance for Little People, and Jumping Beans.