Well, you were just starting, and the story changes as it goes. The characters grow on their own sometimes, so no one can really hold it against you. You handled Gwen and Emma well. As for Aine, my suggestion might require you to rewrite her part in the prologue, but I think it would make her more likeable and improve the relationship overall.
The only tweak I’d suggest is to make her recognize him but not know how to face him. Show her agonizing a little over it while dropping hints that she didn’t bully him because she wanted to, and that she feels regret about it. Or, if you think that would mess up the story, then at the very least make her remember his name (When she talks with Freya on the phone, she says she even forgot his name lol) and that he’s still the guy she likes and wants to meet and apologize to, now that she thinks her mother has finally given her freedom.
That way, even if she doesn’t recognize him right away, it would still fit her personality. She’s a bit naive, and he did lose weight and change, so it’s believable.