If a married woman commits Zina and sincerely repents, can she marry that man after a divorce or widowhood? Are there any atonement options or other measures she should consider?
Bismihi ta'ala
No, she cannot marry that man at all, and under any circumstance.
Of course, there is a slight difference of opinion among our esteemed jurists, so it is best for her to also confirm the fatwa of her Marja' taqleed.
And Allah knows best