With no clues since a pregnant Mount Vernon woman disappeared a week ago, her family spent the weekend plastering Westchester and New York City with fliers, photos and pleas for information.

Gizela Andrade, 32, hasn't been heard from since she disappeared on Sept. 25 after a fight with her live-in boyfriend, and her digital trail has gone silent as well, according to authorities.

A distressed Andrade spoke to her twin sister, Gabriela Larison of New Rochelle, that same night. She told her sister she was driving around Mount Vernon in her white 2010 Toyota Venza to mull things over. Larison told Andrade she could stay over her Mount Vernon home if she wanted to, but never heard from her sister again. After waiting a mandatory 24 hours, Larison filed a missing persons report with the Mount Vernon Police Department.

Compounding the family's worry is the fact that Andrade is a diabetic and going without insulin can be fatal. Aside from being twins, Larison and Andrade are each other's only family in the U.S. – they are natives of Sao Paulo, Brazil, and Andrade has been living and working in the U.S. for more than seven years.

Just as worrying, Larison said, is the silence – she and her sister spoke by phone several times a day, conversations that became more frequent once Andrade became pregnant. Their mother remains in their native Brazil, but has told Larison she wants to come to New York to help look for her missing daughter.

Mount Vernon police are taking the disappearance seriously and have assigned detectives to the case. But family friend Hermes Guedes said he has the sinking feeling that "they're kind of stuck right now."

Andrade hasn't accessed her bank account or used her credit cards since her disappearance, and it appears the car doesn't have LoJack, or it's not functioning. In addition to plastering local towns in Westchester with fliers, Larison, Guedes and others checked all area airports to see if Andrade had taken a flight or left her car in an airport lot – anything that would indicate she's alive and well.

"She's not taking money out of the bank and she's not using the car, so it's hard to tell what happened," Guedes said.

Guedes said Larison is handling the situation with poise and determination.

"She's been pretty strong, pretty tough, because she's trying to do everything she can," Guedes said. "Everybody's doing their job, just to hope that something will come up."

In the meantime, Larison has met with a private detective and will likely contract the investigator's services to supplement the work being done by Mount Vernon police. Updates have been few, and family and friends say they want to do everything they possibly can to search for Andrade, who is four months pregnant.

In the meantime, all they can do is hope for the best.

"It's not going very well," Larison said, "not at all."

Andrade was last seen driving a white 2010 Toyota Venza, with the license plate number EWX3056. Anyone with information on her disappearance is asked to call the Mount Vernon Police Department at 914-665-2500.