Depends on the office. Usually around three weeks to two months.
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It varies among USCIS offices. Some will test 1 month later, another 3 months later. Tell her to study: http://www.uscis.gov/portal/site/uscis/menuitem.749cabd81f5ffc8fba713d10526e0aa0/?vgnextoid=982a309186e89210VgnVCM10000025e6a00aRCRD&vgnextchannel=c242df6bdd42a210VgnVCM100000b92ca60aRCRD
She can re-take the exam, provided the examining has not denied the application and is giving her another chance to come back and be re-examined. All of the materials for the naturalization test are available on USCIS website, at www.uscis.gov. Make sure she has an experienced immigration lawyer who could help her be prepared for next time.
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The more important question is: How long will it take for your sister to do a better job of studying?
I suggest that she wait at-least 3 months and that she pay for intensive tutoring sessions.
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I agree with my colleagues. It depends on the office location. Also, her best bet for success is to take adequate time to prepare. Perfect practice makes perfect.
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