Does Bella control her thirst when she is a vampire?

No, because she smells like vampire and human to them so they wouldn't drink her blood and kill her

No, obviously not. That's a stupid question. If you were a vampire would you drink your own blood? No! Relating to the first answer, because she also smells like a vampire, she is unable to drink her own blood. Plus, Edward or Bella or Alice or someone would stop her first. You know you love me, XOXO, Gossip Girl (lover).