Your mother probably does not have a case, at least not because of her medical condition. If her employer didn't know about her medical condition, even if it were a disability for which the employer would have been required to reasonably accommodate her, the employer wouldn't be liable for terminating her. The only way she would have a claim is if an employee handbook, statements made by her employer, etc., created an employment relationship in which your mother could only be terminated "for cause." Making that determination would require a more in-depth discussion than what is practical on this forum. If you think her employer was required to take more disciplinary "steps" prior to terminating her, it may be worth contacting an attorney to review the facts of her case. I hope this helps. Take care.
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(1) Did your mother "inform" (put on notice)
her boss of her medical condition?
(2) Did mom ask for any accomodations
because of her condition?
(3) Was there an "Employer-Employee"
(4) Did management "violate" their own
-----There's LOTS of questions that need to
be answered to discuss this properly.
THIS ANSWER IS PURELY FOR ACADEMIC DISCUSSION ONLY AND DOES NOT CONSTITUTE ANY TYPE OF LEGAL ADVICE OR LEGAL REPRESENTATION.