1. She can indeed have magic literally in her blood. It's a thing. Your spiritual inheritance comes from a variety of factors, physical bloodline is one of them. Spiritual bloodline is another, the octave of being, past lives, natal astrological factors all contribute as well. Some people are indeed born stronger than others. And someone born into a magical family is in no way superior to other magicians, except maybe not having some social programming holding them back, though I've met individuals coming from normal and mundane families who's abilities greatly outclass that of most hereditary witches. You aren't born with the keys to power, but you're also not born a blank slate. Unrealized potential is worse than limited potential.
2. No one is or ever will be special. No matter how powerful, intelligent, or supreme. The moment you start seeing yourself as self-important or eternal, you lose both everything you've accomplished, and the ability to progress. This, however, is a post best left for another time.