Going to a chiropractor for shoulder weakness? Is she a quack or legit?

the purpose of chiropractic is to correct the cause of nerve interference. nerve interference is produced only from upper neck vertebral misalignment, therefore, that should always be the focus of the doctor's attention, whatever else they may do additionally which, by the way, may feel good temporarily, but is entirely unnecessary. also, you must avoid straining your upper neck if it is to stay in place.