On 15 May 1927, Mardanshina was born in the village of Verkhnemancharovo, Birsky District, Bashkir Autonomous Soviet Socialist Republic (today the Ilishevsky District, Republic of Bashkortostan). She and her family relocated to Almachik [ru] soon after she was born.[1] Following her graduation from school after ten years, Mardanshina began working as a teacher at the Kazy-Eldyak elementary school (part of Bayagildin Village Council) in the Dyurtyulinskii District in 1944.[1][2]
At the request of her brother, she relocated to Sotsgorod [ru] and began working as the assistant for oil and gas production at the No. 2 oil field of the Tuimazaneft Oil Production Department in 1946.[2][3] Mardanshina remained at the post until 1985.[4] In 1947, she was appointed operator for oil and gas production and was moved to the company's No. 5 oil field four years later.[1][2] Mardanshina worked with 16 oil wells as well as maintaining others.[5] She was required to pump the production of oil hourly from the measuring tank to the tanks by hand in an era where this process was not mechanised.[2] At some wells she oversaw, Mardanshina conducted assignments introducing and developing new equipment and field radio dispatching experiments,[2] took part in testing of two new equipment designs developed the by the design bureau of oil instrumentation. She stopped working as an oil and gas production operator in 1971.[1]
Mardanshina served as deputy chair of the trade union committee of the NGDU between 1971 and 1981.[2] She worked to better the role of trade union organisations in collectives' lives, developing competition and disseminating improved practices.[1] Mardanshina was the head of the NGDU's technical office at the Museum of Labour Glory of the Tuymazaneft Oil and Gas Production Department in the House of Technology from 1981.[2][3] She also had an active role in the social and political scene.[3] Mardanshina was a deputy of the fifth convocation of Supreme Soviet of the Bashkir ASSR [ba; ru] between 1956 and 1960 and a deputy of the seventh convocation of the Supreme Soviet of the Soviet Union from 1966 to 1970.[1][4] She served on the Oktyabrsky City Council of Workers' Deputies.[1] On 10 September 2017, Mardanshina died in Oktyabrsky, Republic of Bashkortostan.[4]