The woman in that video is asking for clarification on what happens if she herself, a citizen, votes. Obama literally says in the video that she's a U.S. citize

The woman in that video is asking for clarification on what happens if she herself, a citizen, votes. Obama literally says in the video that she's a U.S. citizen. She wants to know if immigration is going to go through voting records and discover the place she lives may also have undocumented immigrants living there.