If you can, separate her from the others. Place her in a cage where she can still be seen by the others, but give her time to self recover. If you do not - the others will see her as a weak link and she will get pecked bullied and weaker. Ensure she has her own food and drink supply.
You will usually see an improvement within 2-3 days because she will not be walking all over the place on an injured foot. If you are overly concerned then there is always the vet, but you cannot really do much other than let her rest to aid recovery.