Sounds like a normal day for my teenage DDs. Sometimes better, sometimes like this, sometimes worse (when they get into the crisps/chips and fizzy drinks...)
As long as your DD seems happy and healthy (in mind as well as body) I think it’s fine. It’s so impt they feel positive about their body at this age.
I try to encourage mine to fill up on more veg by offering snacks of easy to grab cut up salad: spinach leaves, peppers, cucumber, carrots. For a meal we add olives, hommous, avocado, vegan cheese, few breadsticks/cornchips to make a ‘tasting plate’.
It is hard when they are vegan. Go for seeds, nuts, nut butters etc to fill them up on calories. And bulk up with pulses and veg.
Mine like to make chia pudding with oat milk and cinnamon, also they do smoothies with vegan protein powder and blendef frozen acai berry bowls. I am happy they are so adventurous and engaged in making healthy choices. But they also eat a lot of Oreos and digestives and crisps!
I’m also happy the DDs are not obsessed with diet rules and can indulge in junk food sometimes and enjoy themselves.
I also have a DS who sticks to ‘beige’ food and is underweight so I hope the DDs will have a positive impact on him.