See my last answer to this question. It's a legal malpractice issue.
The information provided herein is for informational purposes and should not be construed to establish an attorney client relationship. To establish such a relationship, the prospective client would need to meet with me in person, and have a detailed discussion about all the facts and circumstances surrounding your case.
I'm sorry to hear about your mother's treatment. In addition to contacting a legal malpractice attorney, you may also consult a local medical malpractice attorney to determine if the statute of limitations has run on your mother's claim. Good luck.