Sorry ... the answer most likely is no.
Meet with an attorney.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- firstname.lastname@example.org -- www.capriotti.com -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship. Also, keep in mind that this is an INTERNET BLOG. You should not rely on anything you read here to make decisions which impact on your life. Meet with an attorney, via Skype, or in person, to obtain competent personal and professional guidance.
Please consult with an immigration lawyer, so he/she can evaluate the facts and determine whether your sister-in-law has a chance to get a cancellation of removal (assuming removal proceedings will commence).
609-271-3573. This answer is for informational purposes only and should not be construed as legal advice.