Following her overseas military service in World War I, she was secretary of the New South Wales Bush Nursing Association for 23 years, overseeing significant growth in its coverage.

[3][4] During her time in Egypt, Morrice handmade a doll for her niece, complete with nursing uniform, which she named "Sister Helen".

October 1917 saw her working under matron Adelaide Kellett at the 25th British General Hospital, a 2400-bed facility fully staffed by Australian nurses.

[5] Morrice joined Georges Heights Military Hospital in Mosman as matron and served there until she was made secretary of the New South Wales Bush Nursing Association (BNA) in 1924.

[8][9] In the 1934 Birthday Honours she was appointed a Member of the British Empire for her work as secretary of the NSW Bush Nursing Association.