It's possible that she died but in a franchise that so far has no significant women in positions of power it seems like a criminal waste to kill her off camera when they could use her more regularly.
How many significant men
in positions of power have we seen in a film franchise that is only two films long?
Unless Orci & Kurtzman have already decided that they want T'Pau dead, or already know that she won't be needed in the next film, I can't see IDW's comic arbitrarily pronouncing her dead.
Have you checked if she's a character on New Vulcan in the tie-in computer game?