i wondered that too..do they just buy her the same size as the twins like they do with her clothes ...and how can they not notice the poor love has her shoes on the wrong feet? one of my nieces does this and we always notice and make a silly joke of it and swap them round for her !
there's literally no reason that they can't buy the girls shoes that fit, even if they want them matching. the shoes look too big for all the girls, but lottie's are absolutely massive on her, and could easily cause her to trip over. those shoes would obvs have been available in a range of sizes, so why not simply buy them matching shoes but in sizes that actually feet each girl individually? just because they're tripkets, it doesn't mean they're automatically the same size - it's like they just don't concern themselves with the differences between the girls - like lottie's smaller size - because it's easier to grab three pairs the same size. it's bad enough when her clothes are hanging off her because she's ended up with the green outfit from a matching set that fits the twins, but when shoes and clothes are bought specifically for lottie and not part of a set of three, there are no excuses not to buy her sizes that actually fit her properly.