If the husband sues, it may create a problem both proceduraly and as to the substance. The judge may not grant divorce easily, even listening two witnesses, if the action is against a foreigner not attending the hearing. she should appoint a lawyer in Turkey and sign divorce agreement (which would also protect the lawyer against fraud claims in the future, and persuade the judge that she indeed wish to divorce.)Two witnesses would be heard. Consequently the case would be a mixture of both grounds.