Hi Sue - my name is ***** ***** I'm a litigation attorney licensed in Tennessee. Thanks for your question. I'll be glad to assist.
It is certainly possible that your sister has a claim for medical negligence
or medical malpractice due to the treatment received by the medical providers. Basically, she would have to show that the treatment she received fell below the applicable standard of care - - which is what a reasonably prudent medical provider would have done in the same situation.
In this case, with a patient who complains of pain, weakness, etc., and the medical providers don't take action to determine the source of the pain in a reasonably quick fashion, it could be that their actions fell below that standard.
The best thing she can do is get her medical records together and see a local PI attorney to review her case and records. The attorney will then consult an expert witness (usually a nurse or a doctor) who will review the records and give an opinion as to whether or not there is a viable cause of action based on the facts as rendered in the medical records.
Thus, she should consider seeing a lawyer asap as the statute of limitations for medical malpractice actions are short - - one year in Tennessee - - so she has to act fast to keep her rights in tact.