[14] Pennock scored the goal that secured the title for Doncaster Belles[15][16] in a 1–0 victory over Millwall with one game left in the league.

[14][19][20] In October 2019, she combined her football career with a job working as a coach at the YMCA, meaning she only attended 2 out of the 3 nightly training sessions run by the club each week.

[21] After Sheffield United joined the second tier of English women's football, Pennock became their top goal-scorer and assist maker of that era.

[22] In 2019 Pennock scored a 94th minute winning goal against Women's Super League team Liverpool in what was labelled a "shock"[23][24] 3–2 victory for Sheffield in the Continental Cup.

[51] At the end of the 2022–23 season, Pennock scored 14 goals in all competitions, 11 of those in the FA Women's Championship to finish as Birmingham City's top scorer.

She was the third player to be announced as confirmed contract extensions ahead of the 2023/24 Barclays Women's Championship season behind Siobhan Wilson and Martha Harris.