Not only are cougar attacks on humans rare, but this is truly exceptional since cougars prefer to hunt solo prey. OTOH freak events are impossible to dismiss when you become the freak, so I wish her a fast and full recovery.
The California attack on a younger woman riding along with two males who immediately fled the scene leaving her to fend for herself was instigated by a starved or sick adult mountain lion that weighed around 60lbs.