I'm guessing the girl V..something .. was a ventriloquist .. possibly the the mother.
Poltergeist incidents often involve isolated teenage girls. Like
Tina Resh in the Columbus Poltergeist case, who was home-schooled (according to earlier sources).
It was the two youngest
Fox sisters who started the
spiritualism craze in the mid-19th century. Margaretta confessed years later that it was a trick.
I recall a "paranormal" TV show of the past investigating a supposed incident. The crew was filming the family that was "being haunted" out in a cemetery. When the cameras turned away from their adolescent daughter, not long after there was a noise among the tombstones. The girl had been holding something in her hand beforehand (probably pebbles). If one looked close at her face one could see she was holding back amusement at how both her parents and the other adults were carrying on in amazement at the "phantom activity".
There was another well-documented poltergeist case in 1934 in Zaragoza Spain that involved a young woman and a family and a mysterious and mischievous voice from a stove. It shares some traits with the talking mongoose case.
https://www.youtube.com/watch?v=a6Lq3awNXfU