This usually happens when the student joins the activity without signing in to Desmos (with either their Desmos account or their Google account). If they don’t make an account, Demos can’t keep track of where they were when they left the activity.
She needs to not choose “Continue without signing in” and create an account with Desmos.
The next time she joins Desmos, her most recent activity will be under “Recent Activities”; she can go back to any of her old activities by clicking on “See all”. (She won’t be able to see any activity that she wasn’t signed into Desmos for, alas.)
