Employment Law Questions? Ask an Employment Lawyer.
While I certainly understand that your wife is not her maid, unless you can allege that she is requiring her to do that work as a means of discrimination due to her race, religion, gender, age, disability or recent FMLA use, that's not illegal work to require someone to do. There is nothing in federal or state law requiring a strict adherence to job descriptions.
Your wife should continue to work with HR to obtain that voluntary package that they were discussing, but unfortunately unless your wife had an employment contract specifically stating that she could only be terminated for cause or that she must get severance at termination, such packages are voluntary from the employer's standpoint also. Unless and until such an agreement has been signed by both parties, there is no binding contract between you.