She was discovered inside the property in Newry, 40 miles south of Belfast, along with a man and woman.
Newry and Armagh MLA, Justin McNulty, tweeted this afternoon: "This community is in shock and a dark cloud hangs over Newry this afternoon.
"It’s my understanding three people have lost their lives. Police are describing those deaths as suspicious.
"My thoughts and prayers are with the families of the deceased."
A Police Service of Northern Ireland spokesman confirmed they have launched an investigation into the deaths of three people.
This community is in shock and a dark cloud hangs over Newry this afternoon.
Detective Superintendent Jason Murphy said: "The bodies of an adult male, an adult female and a teenage girl were discovered at around 11am this morning.
"The circumstances of the deaths will now be subject to investigation and post-mortem examinations will take place in due course.
"At this stage it would not be appropriate to elaborate further on the circumstances as our enquiries at an extremely early stage."
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