Having spent many happy years motorcycling those very roads my guess is that she stopped, perhaps to let a car past the JCB, then rolled backwards and dropped the bike and was looking for help in lifting it. The discarded jacket and helmet might mean she was having a bit of a nightmare getting it upright while preventing it from rolling back; she would need to get to the gear lever on the left hand side and pop it in gear to hold it on the hill.
If you move a couple of hundred yards down the hill a car seems to have stopped beside the JCB.