I know of some vampires whose gift is to specifically compel someone to do their bidding, or other ways to indirectly achieve it, but not as a blanket power for all of our kind. That must make feeding without leaving behind evidence much easier.
In my experience, other people's sisters are generally much more astute than their brothers. Not to dissuade from the level of your own talent.
Rebekah I think I've combed through the details of my own books for foreknowledge of my loved ones as much as I can stand, right now. I would love to fight, although I must warn you I'm hard to beat. Telepathy has its uses.