The message sent to Miss Sarah Denney in 1915 reads:
Dear sis how are you getting along
I am dandy hope you are having a fine time down there
by Walter
The message doesn't seem to indicate that Sarah was recovering from illness or injury, so perhaps she worked at Burns Hospital.
Here's another view of Honesdale, which currently has a population of about 5,000 (about 3,000 in 1915) :