Can illegal immigrants in the United States pass?

Your mother needs to apply for a B2 visa. Frankly speaking, American visa is the most difficult visa in the world. The procedure is the same as that of ordinary applicants.

Because you are already a doctoral student, it is impossible to apply for accompanying study. Accompanying students means taking parents to1students under 8 years old. The younger you are, the easier it is. The United States does not have this system.

Because B2 visa includes settlement and short-term residence, you should choose to visit relatives when filling out the form. You also need to provide proof of residence and school status in the United States to the Immigration Bureau.

In addition, the issuance of a visa does not mean that you can go to the United States. The US Customs will carefully check the purpose of immigration and may be refused entry at any time. You'd better take her to America. If there is anything that can be solved immediately.