In reply to no_more_scotch_eggs:
I was in the gully at the same time as the OP and started climbing down after the woman had fallen past us to see if there was anything I could do to help. A few seconds later we heard people shouting that she was okay, so while her partner went down to get to her, everyone else who was already quite far up the gully (including myself and the OP) continued to the top.
Anyway, I spoke to some guys in the car park later that day who said they were near where she came to a stop and attended to her. They said she was bruised and possibly a foot/ankle injury which would explain the MR helicopter. However, that's just what they told me, so not sure how accurate that is. Would be good to get a confirmation that she's doing okay though!