Spencer began playing bowls at the age of nine, following in the footsteps of her father, Martin Tomlin and grandfather, Mick Tomlin, who competed together in the men's pairs at the 1990 World Indoor Bowls Championship.[2][3][4]
Having played for England at under-18 and under-25 levels, she made her full international debut in 2017.[5] A year later, Spencer won the English national women's indoor pairs and mixed fours titles as well as captaining England to the British under-25 team championship.[6][7] She claimed the English national indoor two bowl women's singles title in 2019[8] and 2022.[9]
Spencer qualified for the 2025 World Indoor Bowls Championship.[2][3][5][10] After taking part in the mixed pairs alongside Mark Dawes,[3][11] she made it through to the semi-finals of the women's singles with a win over Lucy Smith.[12][13] Spencer lost her semi-final match to Beth Riva in a tiebreak after the two sets were split.[14][15]