Jayaaa ji, My advice for you is to connect with a good immigration lawyer. It seems like she had a lot of unlawful presence which can trigger a ban. Unless you are a practicing attorney, it is very difficult to understand the intricacies of the legal system. DO NOT answer NO if you're not sure about unlawful presence. If you lie in the application, then it will create more headache for the future. Spend some money and hire an experienced immigration attorney.