The poor lady has been tremendously wronged but the Benevolent Qur'an has answers to all problems.
She has the right to divorce her husband even in-absentia. She will be his wife unless she divorces him.
She should write a divorce letter to him signed by two witnesses, including the following verse and mail it to his last known address even if it is her own home. Briefly describe the reason for divorce. Must keep a copy. No 'Iddah' is required in this case if the couple have not touched each other intimately for so long (maximum 'Iddah' is 4 months 10 days even for a widow).
4:19 O You who have chosen to be graced with belief! It is not lawful for you to force women into marrying or holding on to them in marriage against their will. Pressuring women to remain in wedlock by threatening to take away the marital gift is forbidden. A wife could forfeit the right to the marital gift only if she has indulged in clear lewdness. You shall treat your wives nicely. Even if you dislike them, it may happen that Allah has placed much good in what you have failed to realize.
Islamic divorce will amicably take place through this procedure if she wants.
Government laws differ in countries, as you know.
24:32 And marry the singles among you, (whether they are widowed, divorced or bachelors). They may marry the righteous among your male and female servants. If they are poor, God will enrich them with His bounty. God is of Infinite means, and He knows all things.