Lot's of chickens get crooked toes, could have been a break/injury that healed that way, or deformity. As long as she doesn't seem in pain, is getting around alright, is able to roost, and eating and drinking well, they usually do just fine. Depending on how the toes hit the ground it could make them more susceptible to bumblefoot, so I would just do a regular foot and toe check. I do that on all my birds anyway, so as to catch it early when it happens.