if the other chickens are not bothering her i wouldn't worry to much, if they are you will need to keep her separate until it heals enough so she is no longer limping or in danger of getting beat up ... as for bumble foot it can be pretty serious. you need some good antibiotic/ first aid supplies to remove bumble foot. untreated it can kill the chicken. its a infection that needs to be treated in order to go away....i don't know of any roots or herbs strong enough to treat staph.