Seriously, she’s useless. If you’re in a tight spot and the only other person around is Elena, you’re screwed and then some because everyone else is either going to trample over you to save her or sacrifice you, if you don’t offer it yourself.
It’s raw, unconcentrated misogynoir that every other witch in the damned TVD/TO verse be dabbling freely in dark magic but Bonnie is severely punished for it