On Wednesday, Tharoor tweeted that his account has been hacked. Published reports on Thursday quoted Pushkar as saying there was trouble in the marriage.
Tarar Tweeted on Thursday: "So I 'stalk' on bbm and phone. The last I checked it was a two-way thing, or maybe technology changed while I 'stalked'?"
In another Tweet, she said: "The wife trashed the husband. Now doing WTH damage control. Isse kehte hain apne hee giraate hain nashemaan pe biljlian..."
Tarar's Twitter page describes her as a mother, a former op-ed editor of Pakistani newspaper Daily Times and a columnist.
There were a flurry of Tweets from her Friday.
"My name is Mehr, and I am not an ISI agent. Or RAW. Or CIA. Or Mossad. Or even the dead KGB. May I go now?" she Tweeted.
Another tweet said: "The only reason why I'm not responding to her trashing me. I respect Dr T very very much. I have nothing more to say."
Tarar went on to Tweet that "for a woman to trash another woman linking her w/her husband is the lowest form of sickness ever. It's nauseous. No respect for her marriage".