Is my wife forbidden to me if she divorced herself and traveled without my knowledge, and is it permissible for me to divorce her?

A woman does not have the right to divorce herself unless she is authorized by her husband; her words to that effect are null and void otherwise. It is forbidden for her to leave or travel without his permission, except in cases of necessity. Her leaving or traveling does not result in divorce. The husband is permitted to divorce her if her character deteriorates or she becomes disobedient (nashiz) and life between them becomes unsustainable.