"Lidocaine must be precisely dosed, and even so, the dose necessary to provide local anesthesia is greater than the toxic dose, in most cases (in small birds). It can be used in tame, large birds, if necessary. Another problem with using a local anesthetic agent is because restraining a bird awake is often very stressful. Signs of overdose with lidocaine may include excitement initially, seizures, depression, respiratory arrest, cardiovascular collapse and death."
That was an excerpt from and exoticpetvet.net.
For pain you can give her baby aspirin. Just make sure she's not actively bleeding.
Dose for chickens: Approx. 25 mg per pound of chicken's body weight each day.
- Examples: For a 6-lb. Large Fowl Leghorn rooster, give 1 baby aspirin or 1/4 of a regular aspirin for a morning dose, and the same amount for an evening dose ( = ~150 mg total per day).