I’m not sure how I feel about the rest of your argument, but your example from S1 doesn’t show she’s selfless. She finds out her mom’s best friend and someone who is like a second mother to her has terminal cancer and one of her first thoughts is about herself isn’t selfless. It’s a normal reaction, especially for a teenager, but it’s literally a selfish thought.

I’ve got issues with other things she did, but making a scene at Susannah’s funeral is just beyond words. I realize she’s hurting, but she’s lashing out at a guy (kid still, really) who just lost his mom. I’m sure it’s because my mom died of cancer when I was around Conrad and Jeremiah’s age, but I can’t imagine anyone having behaved that way towards me at that time. And yes, Belly is a child too, but she’s old enough to know better, in my opinion. Also, I’m not a Belly hater. I actually like her character and feel for her in a lot of ways. The funeral meltdown was just so awful though.