Rubuta ci gaba don wannan sakin layi - Johnston ta lashe lambar zinare biyu tare da National Women's Under-22 Team a gasar Air Canada. Rebecca ta fara fitowa a gasar zakarun mata ta duniya ta 2008 ta IIHF, tana wasa a duka wasanni biyar yayin da Kanada ta lashe azurfa. Rebecca Johnston memba ce ta Teamungiyar Under-22 ta Kanada. U-22 ya halarci gasar MLP, wanda aka gudanar a Ravensburg, Jamus daga Janairu 2 zuwa 6, 2009. Johnston na cikin tawagar da ta lashe lambar azurfa. A gasar, Johnston ya tara maki bakwai (3 burin, 4 taimaka). Wasan da ta fi taka leda shi ne a wasan da ta yi nasara a kan Rasha da ci 11-0. Johnston ya zira kwallaye uku kuma ya kara taimako. Baya ga Kofin MLP, Johnston ya buga wasa tare da Babban Teamungiyar Kanada a cikin Kofin Al'ummai Hudu tsakanin Nuwamba 4<unk>9, 2009. Johnston na cikin tawagar da ta lashe lambar azurfa. A wasan lambar zinare na gasar cin kofin Four Nations ta 2010, Rebecca Johnston ta zira kwallaye na biyu na wasan ta lashe lambar zinare ga Kanada. Wannan kwallo ta zo ne a wasa mai karfi da karfe 6:21 a cikin karin lokaci. Wannan burin ya baiwa Kanada nasara 3<unk>2 akan Amurka. Shi ne Hockey Canada ta 12th gasar a cikin gasar ta 15 shekaru tarihi. Za ta jagoranci dukkan 'yan wasan Kanada a gasar tare da kwallaye hudu. A cikin wasa da Rasha a gasar cin kofin duniya ta mata ta 2012 IIHF
, Johnston ya rubuta wasan maki biyar (goal daya, taimakawa hudu) a cikin nasara 14 zuwa 1. A watan Disambar 2013, an sanya sunan Johnston a cikin jerin wasannin Olympics na 2014 don Kanada.