Divorce is not adultery.
Divorce causes the woman to commit adultery because she has no Husband and is married. As far as God is concerned, she was married, and so was he. Yet if the man divorces his wife, HE causes her to commit adultery. Jesus said in Matthew 19:3-9
3 The Pharisees also came to Him, testing Him, and saying to Him, “Is it lawful for a man to divorce his wife for just any reason?”
4 And He answered and said to them, “Have you not read that He who made them at the beginning ‘made them male and female,’ 5 and said, ‘For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh’? 6 So then, they are no longer two but one flesh. Therefore what God has joined together, let not man separate.”
7 They said to Him, “Why then did Moses command to give a certificate of divorce, and to put her away?”
8 He said to them, “Moses, because of the hardness of your hearts, permitted you to divorce your wives, but from the beginning it was not so. 9 And I say to you, whoever divorces his wife, except for sexual immorality, and marries another, commits adultery; and whoever marries her who is divorced commits adultery.”
If there was no sexual immorality, there is no grounds for divorce Yet it did happen because of the hardness of man's heart.
The woman is forced into adultery because she had no man and is no longer a virgin; she was a wife. How can she return to good standing with the community and God when one, she is not a virgin and not married, two has no status or representative on her behalf, and three cannot worship in the temple.
She is forced to 1. remarry 2. become a prostitute. 3. be stoned and removed.