She will not have to travel to her country of origin to be able to apply for adjustment (residency). However, for the time that she is waiting for the visa to become available (3-5 years) since you are a US Resident, she will be illegal and immigration could start deportation proceedings against her during that time regardless of the visa petition outstanding for her. Once she files for residency and work permit, she will be safe until the residency is granted.
Answered on Mar 21st, 2012 at 12:18 PM