I think Leghorn. Body morphology and single floppy comb make her that. There are brown leghorns as well ... she could be a mix of white and brown with yellow legs. Is her skin yellow under them feathers?
She may be one of those unique ones that did not inherit the gene for silver lace wings ... or she is a leghorn that got dropped in over the tub partition. I have seen weird batching at Tractor Supply. You don't always get what you think they are selling you ... the surprise is when they grow...
Mine were flights the first couple days ... once you handle them 2-3 times a day, they'll come flying up to you to be cuddled and held. Never knew chickens could be that intelligent and friendly. Maybe cause they bonded with me ... Tractor Supply shipped 1-2 day Olds I rescued. These gals...