"It is a case which the Embassy had taken up very seriously with the US government. When she was apprehended, we worked through the night as we got the information in the night. We woke up the US officials in the night and got her released the next day," she said.
Shankar was talking to reporters after a meeting with Home Minister P Chidambaram here.
The envoy said there was concern over the way the 18-year-old student was apprehended.
"Now she has sought permission to file a case against the US authorities and she is fighting it. Subsequent to her release, we have conveyed our concern to the US government about the way she was treated. The case is obviously a matter of concern to all of us," she said.
Krittika was arrested by the New York Police on February 8 on the suspicion of sending obscene emails to her teacher in Queens' John Browne High School. She was released a day later after being found innocent.
The girl is now suing New York City's Government for USD 1.5 million for what she claims was a wrongful arrest.
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