actually, with current "technologies" as you mention, that still isn't possible...the most muscular men on earth currently only weight nearly 300 lbs (that's NEARLY not actually 300 lbs) so she would probably be about 50 lbs less than that...for example, aleesha young, and colette guimond, the two most muscular women out there right now, are only about 220-250 lbs (i actually can't remember) and they also juice up a ton...and with the height issue, any person (man or woman) who reaches 7'0" tall, faces early onset gigantism....they have very many health problems and their bones and muscles decay quickly...look at some of the taller basketball players...
the fact of the matter is, a 7'0" 500+ lbs woman is just fantasy...which is why I guess it's in this thread!! haha XD
but no, it's not possible with today's technologies....