Hello and welcome,
The only way to compel the employer to modify your ex's termination status normally would be through a court order by seeking a declaratory judgment.
If she retains an attorney, they could communicate a demand to the employer or litigation will follow, or seek to have the employer enter into a confidentiality agreement whereby information related to her employment will not be released to third parties.
I hope you found my answer helpful, even if the law is not in your favor; please click on the GREEN ACCEPT button above for my answer. This is necessary for me to be paid for my work and so that I can get credit for assisting you. Your question will not close, and you will still have the opportunity to follow-up if needed. Leaving a bonus and positive feedback is not required, but doing so is certainly appreciated!
If you have additional questions, please keep in mind that I do not know what you already know or don't know, or with what you need help, unless you tell me. Please consider that I am answering the question or question that is posed in your posting based upon my reading of your post and sometimes misunderstandings can occur. If I did not answer the question you thought you were asking, please respond with the specific question you wanted answered.
Also remember, sometimes the law does not support what we want it to support, but that is not the fault of the person answering the question, so please be courteous. Thank you.