Edard did. First he injected venom into her herz with a needle then he bit her multiple times to get as much venom into her as he could. This happens in Breaking Dawn, chapter 18.
ok look at all the posts that are here...read over them...THEY ALL SAY THE SAME THING!!! LOL anyhooo no one really BITES bella but edward injects venum into her herz so she becomes a vamp. then he bites her wrists to get as much venum into her as possible