First of all, memories are weird, especially at that age. It wouldn’t surprise me if some of it was true, the GB back then would frequently dine communally with other Bethelites.
I remember sitting with ~20 people at a table for dinner and the table was headed by a more senior Bethelite, occasionally someone from the writing department or zone overseer, especially if there were visitors at the table would be the “captain”.
They stopped allowing kids on these work-at-Bethel in the mid 90s and I’m not sure they even allow anyone at all at this point unless you are actually appointed, but back in the day entire groups from congregations would go only vetted by local elders.
I am sure that if she was at one of these, she’d occasionally run into a higher up. They would do “lowly things” like volunteer to do bathroom cleaning just to show they were humble, their whole persona is staged. I never talked to them, but the story seems believable, they at least pretend that your personal issues are something they truly care about.
You can see that in the letters from that era, if you had a question and sent a letter, they would at least pretend that the entire GB had a big meeting about it and then answered the question.