I thought the same thing, and if it was made to look like a Jedi killed her, that would force Anakin/Vader to hate and wipe out all the Jedi. But, like said before, Anakin wouldn't have seen the twins (as he doesn't know about Leia), and she couldn't have died before the birth. Unless he is just told about it by Sidious...
Dustin Harper
http://www.overclockersrip.com