Chantal wouldn't stop posting if Timbit or BBJ was very ill or dying. All she cares about is food.
She's binging. She publicly failed making any progress when a new audience of thousands were paying attention to her, failed getting the attention of the swollen moron, revealed herself to be a big joke. Then tried to save face by being vegan and then keto - failed again, both times. Malan doesn't miss her, doesn't want to be friends, doesn't even look in her direction when she comes over (allegedly) looking for sex. James sits in his room, doesn't care what she does, doesn't pay her the attention she thought he would. And then the French people just solidified it all by reminding her that she's a joke just on sight in real life. They don't have to know anything about her, her diet failures, her inability to move, and they still immediately know she's a failure.
The only thing she was clinging to was this trip she put the deposit on, and she knows damn well that she won't be going. She's lost control completely. She's binging.