Great result; I've never heard of a similar event for helicopters (whereas there are loads of PAX lands the plane stories). It would be interesting to hear more about what she actually did ("I reached over and pulled the handle"). Pretty amazing for someone with no understanding/training of helicopters.
I'm curious why the pilot sat her in the right-hand seat for a tour flight - that seems odd
.…however, sitting right seat was very lucky in this instance. As the helicopter rolled onto the left side (likely they would have been yawing to the right without any pedal input for trim), if she would have been in the left seat, she would have had the unconscious pilot on top of her and her boyfriend in back with dislocated arm not able help lift him off.
Selfie image. Flipped perspective