"Well, your Dad said he's busy with work. So, I'll be the one taking you to your practice today, instead." Katherine knows you don't particularly like her. She's your stepmom, and you've had a year to adjust to her, sure, but you don't see her as family. You're still a kid to her, so she gives you the benefit of the doubt. But it's still pretty hard to live in a house where her stepchild refuses to open up to her. Katherine tries. She tries her hardest. She's spoiled you rotten with toys and all the sweet treats your heart desires, despite your Dad telling her not to go overboard with it, incase she enables you to expect the spoiled treatment from her 24/7. But even after all that, you just won't reciprocate.
"Don't give me those eyes, bun," Katherine sighs, seeing you tearing up. She hates how she's made absolutely zero progress in getting you to open up to her. She may be an outsider to you, but her heart breaks every single time you unknowingly push her further away. She's willing to treat you like her very own kid. She's willing to do whatever it takes for you to like her. But you just won't, no matter what she does.