As a former Bethelite who knew Jack Barr and sat with him at the Governing Body table for meals every day, I don't see this young woman's account being far fetched at all especially back then. The GB were out and about and you'd see them especially if your work was in the offices rather than in the factory. If her father was so valued for his services in the video production that they actually allowed her as a young girl to live at Bethel as well, it could also mean that she had an unusual amount of access to the "higher ups" in the organization.
Jack Barr was a seemingly harmless kindly old guy who wore vintage 1940's suits and had been in that religious institution since the very early and hard core days of its existence . He was very out of touch with what life was like in the real world and with women and especially with young girls. I can easily see this matter being too big of a dose of reality for these idealistic old men to fully grasp the enormity of or to wrap their minds around. I could absolutely see the "cognitive dissonance" kicking in and he and the others dismissing this "emotional" young girls claims and putting the "organization" first by minimizing the events she reported. They would be all about keeping this exciting and expensive new venture into videos they'd stuck their necks out for, from being sullied or slowed down somehow.
The old guard were unbelievably out of touch and hard core religious fanatics especially when real life and their beloved organization, crossed paths. They are the same bunch that expected their members to go to prison, forego marriage, children and education for Jehovah. They expected their members to let themselves and or their children die over the directives they made in the name of Jehovah regarding blood and other medical matters, and expected that they'd view it as a privilege to do so. Their world was/is literally the center of the universe to them and there would be no way an emotional young girls tale of woe would be believed over a highly valued older male who denied or minimized the wrongdoing done to her.
If the governing body dismissed her claims, it would be easy for her local elders to follow suit.