variable:
Come to think about it, I think it's a potentially cool concept.? It would be another story working off the primal wish of getting a 2nd chance to live one's life over,? to right the wrongs, to make better decisions.? And I would suggest her biological time clock should age -- or rather youth -- backwards one day at a time.? However, the world doesn't.? It keeps moving forward in time.? Which presents interesting choices she has to make.
But I fear that the 1st reaction of most movie makers will be what mine was, "Oh,? that was already done with 'Benjamin Button'." So I think the logline (as well as the script) needs not only a different inciting incident (which you've got ) but a more interesting objective goal than finding the manufacturer.? I think her objective goal should be to seize the opportunity to live the life she always wanted to live but didn't have the guts to live.
fwiw