Her first teaching experience was at Jiggi Provisional school located north of Lismore on the NSW Far North Coast.
She was appointed on 6 November 1885 but resigned, without giving any reason, from 30 June 1886.
When she returned to the teaching service, she was placed on probation at Summer Hill Public Infants in Sydney.
She then had to pass three qualifiying exams before she could be admitted to the teacher Training School.
After struggling to pass the first one, she then passed the other two and went on to pass the entry exam for the Training School, although she did not gain a scholarship.
She was then 'removed' to Stanmore Public Infants, not far from Summer Hill.
It appears her performance was not satisfactory because she was then instructed to 'act' as a teacher ('acting teacher') at one place, and then at Breelong West Provisional commencing 31 January 1899.
She failed to gain classification at an exam in June 1899 and was then instructed to continue to 'act' as a teacher at Woodfield Probational and then Woodfield Public.
Her next appointment was to Lithgow Public Girls as an assistant teacher on 90 pounds per annum.
She had previously been earning 88 pounds per annum.
Her final two appointments were in the Newcastle area at Wallsend Girls Public and Wickham Infants.
Mary Ann Edwards resigned without gratuity on 25 September 1903.
She then married John Thomas Mawbey Jnr and went on to have 16 pregnancies (according to one her sons) of which nine bore fruit.