The instructor would have been well aware of the danger but being an invisible force it can be impossible to see.
Invisible force indeed, which is why you don't just let your student sit there and rack up further points on the risk grade by allowing them go in low and slow, reducing the number of recovery options from limited to pure luck.
When you get quite a way through the syllabus your instructor should take a back seat
"Back seat" or not, she wasn't P1 solo... so the instructor still bears ultimate responsibility for what went on in that flight !
She was very lucky no to be in a Traumahawk or something else that loves to drop a wing at the slightest opportunity.
Guess we have differing views, so I best leave it there....