 From the late 1940s onwards, she undertook key excavations in south-west England, shedding new light on prehistoric occupation of Dartmoor, Iron Age hillforts in the region and the Roman military presence in Cornwall.In 1965, she was a founding member of the Hillforts Study Group, alongside Christopher Hawkes and others.In the late 1960s, Fox played a key role in establishing the Exeter Archaeological Field Unit.