I agree, I'd give the Calcium once daily for 5 days and get some Permethrin dust and treat her for the lice.Could she be egg bound? Have you given any calcium yet? Has she been eating anything or drinking fluids? Get some permethrin garden dust from a feed store. Prozap or Gardenstar are some familiar brands. Put it in a sock and dust them all over the skin and under the vent. Repeat it in 7 days to get the newly hatched lice.
See if she improves.