Gill spent her formative years under the late Pat Smallwood at Radnage House. The highlight of a successful eventing career was winning Burghley on Shaitan in 1969.
She was appointed Team Trainer to the Junior Eventing Team in 1980 and to the Young Riders Eventing Team in 1981. Gill was also Chef d'Equipe of the Junior and Young Rider Team from 1984 - 2011. Under her supervision, training and management, to date the Juniors and Young Riders have won 96 medals at FEI Championships.