Webb's experiences of poor patient conditions and treatment while working at Sunnyside Hospital in the 1970s inspired her to become a disability advocate.

[1][4] While working for the hospital, Webb completed a PhD in 1984, and a Post Graduate Diploma of Health Services Management in 1992.

During this time, Webb reduced the number of in-patients at the hospital from 150 to 25, by developing community care plans for patients.

[7] In January 2001, Webb was elected as one of the inaugural members of the Canterbury District Health Board,[1] during which she worked on developing the Intellectual Disability (Compulsory Care and Rehabilitation) Act 2003.

[9][1] In the same year, Webb ran an unsuccessful bid to become the mayor of Selwyn District, coming second to incumbent Kelvin Coe.

[10] Since 2020, Webb has worked with Living Options, a charitable trust supporting people with disabilities in the Queenstown-Lakes District.