Answer
Based on official Jordanian legal texts
Under Jordanian law a wife leaving the marital home is not automatically deemed nushūz; the conditions of nushūz must be present and judicially established. Article 62 defines a recalcitrant wife (nāshiz) as one who leaves the marital home without a lawful reason, or who bars her husband from entering before requesting a move to another residence.
The same Article 62 makes clear that lawful justifications for a wife's departure include the husband's abuse, mistreatment, or her not being safe as to herself or her property; if she leaves for a lawful reason she is not nāshiz. Article 61 also permits the wife to work outside the home where the work is lawful and the husband consents expressly or by implication.
The effect of established nushūz is confined to the loss of maintenance during the nushūz period only, as Articles 59 and 62 require, without forfeiting her other rights such as the dowry.
Nushūz is not proven by the husband's mere claim; rather the matter is put to the judge, who assesses whether the departure was lawful in light of the facts and evidence, and that assessment remains within the judge's discretion.
This is a general explanation based on Jordanian Personal Status Law and does not replace advice from a qualified lawyer in a specific dispute.