In reply to john arran:
Yep. TobyA, it's on her blog (in French) but I suppose it's not made clear on whatever you looked at.
"La date et l'heure que j'ai données au début sont importantes puisque je suis née le 18 août 1990 à 12h20. C'est donc à 20 ans que j'ai commencé la voie et le temps de descendre du haut, c'est donc à 21 ans moins le quart que j'arrive en bas"
Rough translation (not had my coffee yet) with a bit of Straggler licence:
The date and time that I started were important as I was born on August 18 1990, at 12:20pm. So, I started the route at the age of 20 and, including the descent, I arrived back at the bottom just 15 minutes before turning 21.
She started just before 11.30am. It was her 11th time on the route.