Mary's hasn't been updated(as 32cm equates to almost 12.6 inches). In AMRL season 2 episode 1, Mary's scene at the grocery store with the cashier, the cashier asks Mary if she is 15 inches. While she wasn't quite fully erect she certainly looked like she was 15 inches(38.1cm).
		
		
	 
Ok, yeah, her length in inches and cm are indeed different on her character sheet.  But, we don't know which is correct, so, she is either 12.2 inches or 12.6 inches, if you were just making that point, I would agree with it.  
However, saying that Mary is actually now 15 inches or over simply because of another characters question and how big it "looks" in one episode, is leap in logic.
In that episode, Emmy asks Mary if she is 15 inches because of exaggerated info that Emmy read about her, as she is a fan of Mary from her old porn days.  Moreover, saying it looks a certain size, doesn't make it fact.  Also, it would just be odd if Mary randomly got 3 inches bigger for no reason.
Having said that, if her character sheet ever gets updated to that length, it will of course be true.  Until then, I'm still going to consider my list as correct.