Why didn't Vicki succeed as one of the hot undead?

• Stefan was too clingy and kept her from her potential.

• Damon was bored with his new plaything too quickly. 

• She consumed Bambi instead of People blood for her first meal.

• Dressing as a vampire for the Halloween party was just so obvious. If she wore Elena's nurse outfit, she'd have been able to get away with the ruse of needing to take someone's blood a little longer.