ANSWER:
If this was the first or second divorce, She cannot get married to the other man as her first husband has taken her back and she is already married to him. Revoking the divorce is the right of the husband and the wife has no say in it! If she gets married then it will be committing zina and adultery which is punishable in Islam by stoning till death. If she doesn’t want to stay married to him, she must file for khulu and give him his dowry back.