Hmm interesting!
I was just checking though the weeks
Week 1 loss: 11
Week 2 loss: 4
Week 3 loss: 5
Week 4 loss: 6
Week 5 loss: 5
Week 6 loss: 8
Week 7 loss: 3
Week 8 loss: 1
Week 9 loss: 6
Week 10 loss: 6
Week 11 loss: 7
Week 12 loss: 117
Everything is totally feasable (if she was on a doctor supervised low calorie diet program and spending the majority her time exercising) until you get to the last week.
With that said my best guess is that the website only allows for 12 weeks because that is how long the television show is. (And I'm guess there was some contractual relationship requiring them to update for that time period). Any updates of weight that they lost since the ending of the 12 week program probable could only be reflected if they changed the results of week 12. Meaning that they could add a week 13, 14, ect.

