Is it permissible for a Christian woman whose husband abandoned her and who then embraced Islam to marry a Muslim man, knowing that there is no Shariah judge to rule on the invalidity of her previous marriage?

If a woman's waiting period (iddah) has expired and her husband has not embraced Islam, it is permissible for her to marry another man. She should take the necessary precautions to avoid legal accountability. If she does not have a Muslim guardian (wali), the Muslim judge (qadi) should marry her off; if there is no judge, then a righteous Muslim man with her permission.