She has performed and taught in the United States, Asia and Europe.
Ritscher served as the Principal Violist for both the Dallas Opera and the Houston Grand Opera and the Assistant Principal for the American Composers Orchestra.
She has commissioned and performed new works by composers such as by Chen Yi, Bruce Adolphe and Gabriela Lena Frank.
She has served on the faculty of the Karen Tuttle Coordination Workshop since its inception.
She was the string consultant for Madeline Bruser's book, "The Art of Practicing; A Guide to Making Music from the Heart."