Fatima, accompanied by Ahmed's relatives and some friends, met Kejriwal at his official residence at Flagstaff road here.
Kejriwal assured that the Delhi government will do whatever was required to help in finding the missing JNU student.
Najeeb Ahmed (27), a student of School of Biotechnology and a native of Badaun in Uttar Pradesh, went missing on October 15 following an on-campus brawl allegedly with the members of ABVP, BJP's students' wing, the night before.
"I am with you and will do whatever is required to help trace him. It's a very serious matter and the government will not let you down and use all its resources available to help you out," Kejriwal said.
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Fatima had earlier said that she had "lost all faith" in the university administration.
Alleging inaction on part of the administration, Jawaharlal Nehru University Students' Union (JNUSU) has been agitating against Najeeb's disappearance from campus.
Following directives from the Union Home Ministry, Delhi Police formed a special investigation team (SIT) to trace the missing student.