Outrage to the point downgrading ties with China? When did that happen? Nobody was asking for Chinese heads on a platter when an Indian diplomat got assaulted(in a court no less) to point of losing consciousness :
Indian diplomat attacked in court by Chinese traders
In Short, Dramabaazi to people who have the time to note said dramabaazi. You know very well how the Chinese would have reacted to a similar "diplomatic offensive."
To answer your other question:
To ensure diplomatic immunity, India shifts Khobragade to Permanent Mission in New York - Indian Express
Not really. Refer the quote above.
what is the source ?
UN is a sovereign body ... just like Edward snowden who is holed up in Equador embassy can't be touched ....Devyani Khobragade can't be touched inside premises of UN .
Shifting her to UN mission is an interim measure ....
This can be followed by subsequent measure such as promotion to ambassador to UN or any other such post which will give her full diplomatic immunity ...
US state department clearance would be necessary when person is yet to enter US ...
as UN headquarter is located in New York ....to get to UN you have to get into US ....
But for person who is already in New York such as Devyani Khobragade ...such clearance may not be required ....
Provide source to your quote, if you have one....thanks .