Her daughter tells a story that (I think) immediately after taping, Perls made a gestures indicating Gloria cup her hand. Then Perls proceeds to flick a cigarette ash into it. A bona fide pig. I also believe Gloria hesitated to expose him with that incident.

Without finding it in the book, I believe you're correct, that her therapist who recruited her for the taping was Gestalt. Pamela said she "imagines" her daughter shrugging and saying "why not?" However, Gloria understood the films would be solely for a training, and was horrified to see them on PBS and even movie theaters. She tried to sue, unsuccessfully, since she had signed away her rights and the written agreement different from her verbal understanding of it.

In addition to her quite recent divorce, Gloria also had recently had left the church despite a strict upbringing. She had done something contradicting its tenets and was treated disdainfully. The daughter implies factors that brought her to therapy were situational.

The book is hard to find and is far more Gloria's overall biography than her behind-the-scenes experience with the film. The family mostly avoided the "Gloria chasers" as the daughter called them, unless there was a particularly interesting opportunity. If you can access a library database, as available through many town and school libraries, you can read: A Review of: “Pamela J. Burry's Living with “The Gloria Films”: A daughter's memory. The Humanistic Psychologist, vol 37, issue 3, 2009.