Well she tried to kill her and Aham, until Aham intervened with the car.
Though he spoke to her the night she wanted to kill herself, she still shocked him on his engagement party, she could have spoken to him prior to the engagement she had time between the time their broke up and Gohem getting engaged, but we all know what she did, she came to the engagement to get him to break off the engagement, having failed and Kokila coming to her house and telling her exactly why she is not suitable for her family and her son.
Anita went to speak to Aham, after the engagement and made him promise to leave his family and be with her. She made Aham choose between his mother and her, and lost, he chose the mother and his family.
She carried on abusing him and on his wedding night she cursed him. Kinjal was telling him to quit the wedding when Sonal walked out, he refused by that time he had smiled at Gopi and was fully intending to lead a normal marriage with Gopi, but that phonecall the night before Suhag Raat by Anita, and the fact Gopi turned up to be illiterate caused lots of problems too.
So yes she faught for Aham, but marriage you don't marry only the man and similarly when you marry a women you don't only marry that person, you form relationships with the family too, and Anita had no relationship with the Modi's and when Kokila after the engagement fiasco approached her she should have called it quits but she didn't she tried twice more, the first time telling Kinjal to lie to go to the dentist/doctor and then later on when she begged Aham herself.