I don’t think Katie looks how she does because she has a learning difficulty, she is the image of her mum
she does look like her mum, but also so much like her dad! Both of them I assume don’t have learning difficulties themselves, and are who Katie looks like yet instead of Lucy seeing that the girls must take after her father as they’re similar to Katie, she just gets her back up. Lucy is aware that Katie has learning difficulties and is clearly overly defensive about it and that’s very obviously the reason she acts so weird whenever someone says the girls look like Katie. She’s so bothered by it that her own feelings and insecurities are very apparent and it’s sad. Katie must see all the comments of ‘wow she’s Katie’s twin!’ And instead of her sister being happy about it or pleased, it’s constantly met by ‘she looks like jenson.’ Or just ignoring the comments all together. It’s so harsh.