spouse transfer case

Let your wife file application for request transfer on spouse grounds, and her application will be given a serious number, and depending on earlier pending cases for such transfer to Delhi, at the appropriate time, she gets the priority.  She has to wait for the chance and immediately after applying for such a transfer she will be informed and a number in the queue will be given to her.   She can request her union members for expediting the transfer if she was a confirmed employe and was working for more than four years already.

Yes, your wife needs to apply for transfer; the matter is at the discretion of the competent authority subject to the extant norms as laid down by guidelines and instructions.

As thew transfer is being sought outside the administrative/controlling unit, she may lose seniority.

Delhi police is a state subject, (except Indian Police Service officers), on the otherhand you have not mentioned which department / appointment your wife is working?

Where do you stand for consideration of posting of spouse at one station, which can not be claimed as a matter of right?

It appears tht your wife is postal employee in other region.

In case there is vacfancy in Delhi Region she can opt for change of cadre on zero seniority.

Post office is not under any state govt it is singular entity only thing is that upto certain level the senioity is at regional level.