I have a student who was raped at age 10 and the person was never prosecuted. She is now 19 is it to late to pursue this case?

In the state of Illinois the statute of limitations can extend beyond the normal ranges when a minor child has been sexually abused. The statute of limitations may extend up to twenty (20) years past the minor's 18th birthday depending on the nature and details of the case.

(720 ILCS 5/3‑6) (from Ch. 38, par. 3‑6)

Sec. 3‑6. Extended limitations. The period within which a prosecution must be commenced under the provisions of Section 3‑5 or other applicable statute is extended under the following conditions:

(j) When the victim is under 18 years of age at the time of the offense, a prosecution for criminal sexual assault, aggravated criminal sexual assault, predatory criminal sexual assault of a child, or aggravated criminal sexual abuse or a prosecution for failure of a person who is required to report an alleged or suspected commission of any of these offenses under the Abused and Neglected Child Reporting Act may be commenced within 20 years after the child victim attains 18 years of age.

See Illinois Criminal Statutes for more information on the limitations laws (720 ILCS 5/Art. 3 heading) ARTICLE 3. RIGHTS OF DEFENDANT