I'm very sorry.That part of her foot does look bigger than the other, but it doesn’t really seem swollen. She gets around and it eating and drinking, but I’m just worried because she’s scratching up her feet with her nails. Will have to be sure we keep that clean so it doesn’t get infected. I’m so sad about this!
It would be hard to know the cause of the crossed legs like that, but since both are the same breed and from the same "hatch" I agree with the post quoted below by @Eggcessive
Can you post a closeup picture of the two chicks standing as they normally would? Leg bone deformities are common in all poultry, and can be due to vitamin and mineral deficiency in the parent stock, heredity, and foot problems can be due to incubation problems. Poultry Cell 1 ml daily per chick would be worth trying if it is a vitamin deficiency in the chicks. Here is an article to read:
https://www.merckvetmanual.com/poul.../noninfectious-skeletal-disorders-in-broilers