Shalvie grew up in Johannesburg, South Africa and received her BSc in Maths and Finance from the University of South Africa. She studied Jewish thought and textual analysis at the Nishmat Seminary in Jerusalem. Shalvie has taught in high schools in Johannesburg, as well as at many seminaries in Israel, both for newly observant students as well as those with religious backgrounds.
She also ran a youth group for English-speaking teens in Ramat Beit Shemesh. She currently teaches Jewish Studies at Hasmonean Girls High School as well as teaching for various parts of the Aish family and raising her own family.