Are we '''sure''' her name was Mary? How do we know? Why was John Yate's widow cited as "Elizabeth" in the will of John's father Thomas Yate?
This far back, even Catholics weren't going in for multiple names yet, so she was either a Mary *or* an Elizabeth - not both. Giving her the wrong name opens the door to wild speculations, like *assuming* that she was only John Yate's first wife, that she wasn't George Yate's mother, and that his actual mother was, as second wife, Elizabeth White of Hutton(!), Essex (who might *possibly* have been just *barely* old enough to marry anyone by about 1642, when her family packed up and moved bag and baggage to France and then to Rome).
I wish people who come up with these theories would consult a map first. Berkshire is west of London; Essex is *east* of it. It's not an impossible distance, but one would think that someone looking for a second wife would look closer to home first - if not in Berkshire itself, then in the neighboring counties of Wiltshire or Hampshire, or Oxfordshire, considering that Lyford was right on the border and is now *in* Oxfordshire..