Can we establish citizenship for my sister and bring her back to the United States?

I need more information. I need her Date of birth. I need to know whether your dad was an American citizen before your sister was born, I need to know whether your mother was an American Citizen before your sister was born, I need to know whether your parents were married, and if so, the date they got married. If either parent were not American citizen byt he time your sister was born, I need to know when they naturalized. I need to know the Date of birth of your mom and dad, and from when to when they lived in the US before the birth of your sister. Are you sure she only had a work permit and not a green card? The laws are different every few years, and a lot depends on the status of your parents. If your sister is an American Citizen, we would need to document it. She could apply for a US passport abroad.

If you can establish citizenship for her through your father, which is something that should be reviewed with a lawyer, then there is a good chance she could return notwithstanding the prior deportation as an alien, but you will need proper proof of the citizenship claim. Without a retainer agreement with this office, there is no attorney client relationship, confidentiality of the attorney client relationship, or responsibility of this office for the case.