I'm glad you posted this, because I'm quite curious and would have liked more answers in TST (although I appreciate that it may have meant the episode would have been taken over with extraneous stuff). 

It seems like Mary was operating under her real name (suprisingly), until AGRA were betrayed.  In HLV Sherlock says she took the name of a dead child five years ago, and in TST she escaped six years ago, so I imagine the new identity was one of the first things she did.

I'm still a bit confused about the nursing training - she may have trained as a nurse as Rosamund, then faked nursing registration as Mary (perhaps possible, if she can hack security).  Or she may have faked other qualifications and trained as a nurse after Tbilisi, but I don't think that gives her time to qualify, get experience, get a practice nurse job, meet John, etc.   And why did she end up with the friend of the brother of the guy who stopped AGRA?

Before Tbilisi - it's very vague!  We know she was with the CIA, so was she living in America for a while?  She does sound "English" in Tbilisi and it's part of the plot.  I have hypothesised that like ACD's Mary Morstan, she was born abroad, but brought up in England. 

I think there really is everything on the stick : names, aliases, false papers, list and details of missions... Everything that could make all A.G.R.A. fall if of one of them was compromised.

I'm not sure if Mary knows that it's Mycroft that put an end to A.G.R.A. After all, Mycroft is practically a myth outside of a selected few. I don't think people would like a man with so much power to govern them if they knew. I don't know if I'm clear in what I am saying... 

Maybe her "you wont love me anymore" comment refers to the guess that agra was involved in the swimming pool stand off? But then the time line is off. In fact, agra cant be accountable for amything thats to do with Moriarty as far as we know him. Maybe only Mary but her own freelancing wouldnt be on the stick. Mysterious...

Well, it clears that up anyway - I always wondered if Mary had been sent to target John in some way, and if that's what she was worried about him finding out.  But at least on the surface, it looks as if she had gone straight since Tbilisi.   She hadn't been involved with Moriarty, or if she had, that's not what she was worried about on the memory stick. 

The fake passport from Norway has a 2014 issue date. If we assume that the show takes place roughly in the same time as RL, she would have been married during this time. She had also kept her weapon and her combat dress. And the flashdrive. To me this does not look as if she had honestly quit her former life. 

Btw, I have no idea why she should have kept the drive. I think it would have been cleverer to destroy it, especially if she assumed that it was the only that remained. Why should anyone keep things that are so incriminating? She thought she was the only survivor, so no other AGRA member could betray her. Or did she know she was not the only one?

And I really wonder about her name. So she took the name Mary Morstan although she was called Rosamund Mary anyway? And we never learn her trust last name either. 

 

She said something like "that was quite a text you sent".  I think she knows what's up, and has planned to escape.  It looks like Sherlock knew that she knew too, so had already set up the memory stick with the tracer. 

It's not clear whether she was still working (she could have been, in secret), but it looks like she had a full-time identity of Mary Morstan/Watson, for the last few years.  And was aware that she could have been targeted during the time, so maybe had held on to her contacts, and was able to procure spy stuff easily. 

Did she say how long she'd been with AGRA?  They felt like a family, so I presume a few years.  Tbilisi would have been 2009, is that right?  And the name change just after.  Mary Morstan was born in 1972, but we don't know for sure about Rosamund.
 

SusiGo wrote:

The fake passport from Norway has a 2014 issue date. If we assume that the show takes place roughly in the same time as RL, she would have been married during this time. She had also kept her weapon and her combat dress. And the flashdrive. To me this does not look as if she had honestly quit her former life. 
 

Mark said in an interview that at this moment the show is playing in the past because HLV was playing out at the then-present time, they have only moved on half a yeas or something like that (trying to guess Rosie's age as an indicator), so they have some catching-up to do. 2014 could be about right.