About six months ago, an upgrade of the show popped up courtesy of Bill B (as well as Glyn who transferred it). While not a night and day difference, it sounds better than the old EVSD release. The transfer had some gaps which were patched with a couple of inferior sources. See here (at the risk of tooting my own horn 😉😞

@ledzepfilm synced the audio of the show to this footage. What an incredible day for Zeppelin fans!

Um...she literally posted a picture of the hoodie and tambourine. Furthermore, as was pointed out above, the film didn't come out for another three years and was quickly forgotten outside of diehard fans. It's not unreasonable to say that she didn't attend the screening for a variety of reasons. Furthermore, even when she did find out she was in the film, that doesn't mean she would necessarily run to the nearest Zeppelin forum to see people speculating on who she is. She attended a concert, got her face on film for 10 seconds, and that was it. She probably thought "cool, they caught me on film!" and didn't think more of it. I don't really think it's that hard to believe.