McNeill comes from a family that is musically inclined. All her siblings play musical instruments. At St. Joseph's Primary School in Antrim, McNeill showed potential as a musician. McNeill took to singing at a young age. By age 7, she was learning to play piano and by age 8, she was playing the violin.[3]
McNeill was part of the junior and senior Ulster / North Eastern Education and Library Board (NEELB) Youth Orchestra, performing with them for 7 years and leading the senior orchestra at the age of 17.[3][4]
She earned a Bachelor of Arts in Music Teaching and Performance, with a focus on violin, from the Royal Irish Academy of Music. There, she studied under Michael D’Arcy. She graduated with First class honours in June 2009 with the highest marks in her year.[1][3]
McNeill performs on a Roger Hansell violin.[1]
McNeill toured with the Irish choral ensemble Anúna as both a solo violinist and as a singer from 2011 to 2016. She also played violin on the Anúna album Illumination released in 2012.[1][5]
In April 2013, McNeill performed the Irish premiere of Finzi's Violin Concerto in the National Concert Hall, Dublin, Ireland.[1]
In 2014, McNeill was a lead performer in the show Ireland Calling as a violinist, harpist, and singer. The show appeared in Copenhagen, Denmark and Dublin, Ireland in 2014.[1]
In August 2015, McNeill played the harp as part of the orchestra in Celtic Woman: Destiny, a DVD and PBS TV special filmed in the Round Room at the Masion House, in Dublin, Ireland.[1]
On 7 August 2016, McNeill was announced as the newest principal member of the all-female Irish musical ensemble Celtic Woman. McNeill took over for founding and long-time Celtic Woman violinist Mairead Nesbitt, who took leave from the group to pursue her own projects.[6][7] McNeill joined Mairead Carlin as one of the only two principal performers of Celtic Woman to come from Northern Ireland so far.[8]
On 15 August 2016, McNeill began recording in the studio for Celtic Woman. McNeill's first live concert with Celtic Woman was on 16 September 2016, in Johannesburg, South Africa. Her first album as an official member of Celtic Woman was Celtic Woman: Voices of Angels.
