She's never shown herself slipping up and eating anything she perceives unhealthy. When she pops to the pub for dinner she orders salad with a side of broccoli. She ran a marathon and wouldn't even consider energy gels, she had to make her own.
I say perceive as being healthy because I think it's debatable. She still loves chocolate, cookies, cakes etc, she just buys vegan versions with fancier packaging and fatter price tags. I don't see coconut sugar as being any healthier than cane sugar. She always seems to go for a pre-packaged snack (usually gifted) rather than a piece of fruit or nuts or something. And in her Vlogmas I was actually suprised at how many of her meals she ate out considering she preaches the opposite. She acts uncomfortable about something prepackaged like a vegan cheese sauce then tries to sell us sachets of protein powder, plant-based ready meals or supplemented teas like they aren't processed.
I also don't think she's looking as healthy as she used to when she was running the marathon. Her skin looks duller, and her body looks weak to me.