Rosaria Sanchez was one of two teenagers, the other being Peter Choi, who rescued Ollie, a five-year-old boy, from drowning in Central Park, and were honored by the city of New York for their heroic deed. 
The two were mentioned in a newspaper article read by Hudson and Broadway in the episode "High Noon".
The two would have returned in a future story of Gargoyles. 
- "High Noon" (Mentioned Only)
- "Tale Old as Time" (First Appearance)