She founded the Morris Knibb Preparatory School and donated a building which is used as the headquarters of the Moravian Church in Jamaica as well as land for construction of a community center.

Throughout the Caribbean prior to the 1950s, the most promising primary students, began working as assistant teachers to offset the cost of their further education.

In some cases, they became full teachers upon passing an examination and in others were sent after their pupil-teacher contractual period to normal schools for additional training.

[9] In 1936 or 1937, she co-founded, along with Amy Bailey, Eulalie Domingo and Edith Dalton James, the Jamaica Women's Liberal Club (LC).

[16] In response, Morris-Knibb joined Amy Bailey, May Farquharson, Dr. Jai Lal Varma, and Dr. Pengelley and others in founding the Save the Children Fund in 1938.

[22] She donated property located at 15 Byrnes Street to the Lower St. Andrews Citizen's Association to facilitate creation of a community centre[23] and was active in programs to care for the poor and the aged.

[24][25] When universal franchise was granted to Jamaicans in 1944, Morris Knibb immediately opened a campaign to run for a seat in the House, becoming the first woman to contest a general election in Jamaica.

In 1984, the school was relocated, from its original location next to the Moravian Church, to 1 Miraflores Drive on Molynes Road in St. Andrew Parish, teaching kindergarten to grade 6.