Three women in their 70s were hospitalized after an elderly motorist apparently lost control of her Mercedes-Benz and plowed into the La Valencia Hotel on Prospect Street yesterday afternoon, police said. A busy stretch of Prospect Street was closed for about 90 minutes as paramedics tended to the injured and police conducted their investigation. The accident victims were near the Whaling Bar & Grill at the La Valencia about 1:30 p.m. when an 87-year-old woman driving a 1978 Mercedes-Benz suddenly accelerated in front of the hotel, jumped the curb and struck them with her vehicle, traffic investigators said. "Witnesses told...