From the moment she got engaged to Veer, she was made aware that Mai and Daddaji do not like her. Mai is a manipulative person, she's only nice to you if she needs you for something (Making Vansh feel better etc.) That does not mean she actually likes Iccha. She never has and never will. Daddaji, for all his great speeches, is completely Mai's puppet. Umed is slightly sensible (at least till now) but Iccha should have realized that his help is useless, he has no say in the household.
So in a situation like this, what will any sane girl do, especially he she has her husband's support to live separately? Listen to him and leave the family. Iccha should have realized that they will never be happy living with the family, considering they all do not like her. God gives you problems, but he also gives you chances to make your problems a little lesser. He gave Iccha several chances. She was dumb enough to not take any of them.
People like Mai an Daddaji are like poisonous snakes. No matter how nice you are to them and all that, they'll only bite you in the end. It's in their nature, you can't expect anything better from them. God helps only those who help themselves is a saying Iccha needs to understand. She keeps on staying in a death trap and is surprised when they hit out at her. Why?
When Mai was found out, and Veer wanted to leave, WHY DID SHE STOP HIM???? Mai had sunk so low, how could she bear to stay in the same house with her? She can just leave and live happily with Veer na? But she not only persuaded Veer to stay, she also brought Mai back. Now she's surprised Mai is behaving badly once again? Arre, who gave her a chance once again? Iccha did.
Insanity is doing the same thing over and over again and expecting different results. I really think Iccha should stop now. I feel really sorry for her, but she brought this upon herself with her own hands. Now at least she should stand up for herself and take steps to make her life better. Only she can do it, not anyone else. She has to stop thinking someone will come and make things better.