They can take it twice in the same day. Other than that, every day until she gets it right. Read the whole article listed in my source section.
An applicant for an Illinois driver’s license may be allowed to attempt the written and/or road tests a second time after a failure in the same day during normal business hours of the Driver Services Facility if he/she fails the first attempt to pass the written and/or road tests. However, if the applicant demonstrates a danger to public safety during his first attempt to pass a written and/or road tests, he/she will not be allowed a second attempt during the same day. An applicant will not be allowed to make a third attempt to pass a road test on the same day in which he/she failed the previous attempt. If an applicant fails the road test 6 times, he/she will not be permitted to attempt the road test a seventh time until he/she submits to the Department a medical report from a competent medical specialist stating that he/she is physically and mentally able to safely operate a motor vehicle as provided for in Sections 6-103(8) and 6-109(b) of the Illinois Driver Licensing Law of the Illinois Vehicle Code [625 ILCS 5/6-103(8) and 5/6-109(b)]. An applicant shall be exempt from the requirement of filing a medical report if he/she has within the previous 3 months filed a favorable medical report with the Department.
