Most likely she was a patient in the Springside Home in New Haven, which was a sanitorium. The cemetery for Springside is on the New Haven/Hamden line with the entrance off Woodin Street. There were supposedly some brass markers to a few graves at one time but all have either been stolen or removed by the City of New Haven. The only marker is a big stone cross at the rear of the burial field. Have you obtained her death certificate from the New Haven clerks office? That would tell you where she was buried.