The highlands of PNG were only opened to civilization in 1947, when an Australian bush pilot noticed villages. The climate is perfect: near the equator at 8,000 feet. The natives have been there for a few thousand years, having emigrated from southeast Asia.
The various tribes constantly fought, with continual bloodshed. Supposedly as a result of that, a tradition developed that the womenfolk would smother to death male babies to reduce the violent male plague. When a first census was taken, there were far more females than males. Surprise, surprise.
With this background, I am skeptical of the woman's story. This may be ancient tradition rearing its head.