There may be no way for your sister to remain the United States after her visa had expired. Your petition for her takes many years to become current, and she won't be able to benefit from that in the United States if she is already out of status. The only sure way for her to stay in the US is if she marries a US citizen, but this option doesn't look good for her since she is still so young. She may need to explore other visa options in the future after leaving the United States.
Answered on Jan 17th, 2011 at 10:58 AM