Sinclair arrived in the United States and taught gymnastics and games at Rosemary Hall School before becoming a physical education teacher at the Bryn Mawr School in Baltimore, Maryland.
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In 1926 Rosabelle Sinclair established the first American women's lacrosse team at The Bryn Mawr School, bringing the Native American game to the United States from St Leonards School in Scotland (where it had arrived from Canada).