She could have the fish burger,
Anyway, Ava is no Sarah, she doesn't go around preaching or even talk about her diet. She has said it's about eating healthy rather than an ethical choice OS site claims...
If I was going on BB I might tell them I'm vego or pesco or something too, I'm a very picky eater, won't eat most meat, won't eat smelly lamb or most weird cuts, spare parts (offal, )etc.
Look I just would rather starve than eat a lot of food other people eat especially fatty/greasey stuff and weird looking meat stuff.
I often use the vego excuse when asked to bad cooks for dinner, vegie options are never as disgusting as some meats & stuff people think are edible
Notice both ladies are fitness freaks, I suspect ava just doesn't want to eat shitty food