Cantonal police said they were alerted at 8.30am and discovered the body shortly afterward in the family neighbourhood of Thunstetten.
The woman “was the victim a homicide,” police said.
The background to the death is “unclear”, the force said, stating that a full investigation has been launched.
But police spokesman Christopher Gnägi is quoted by 20 Minuten online as calling it a case of an “intentional crime of violence”.
Officers immediately conducted an extensive search in the area around the apartment with an eye out for suspicious objects, police said.
The local institute of forensic medicine is continuing to examine the body for clues.
The investigation is being directed by the Emmental-Oberaargau regional prosecutor.
Residents of the village were unnerved by the news.
“Everyone knew her in the neighbourhood, we are profoundly shocked,” a tearful neighbour told 20 Minuten.
“She was always cheerful and waved to me from the balcony,” another resident told the newspaper.
The woman participated in local events and had a “long-time friend” whose car was often in the parking lot in front of the apartment building, the resident said.