Wait if Flare got her magic from the eternal flame, would that make her a flaming hair dragon slayer or something? because the eternal flame is Atlas flame the dragon, soooo it would make sense if she was right?

No, not exactly. Remember how Natsu, Gajeel,Wendy Laxus, etc., got their Dragon Slaying Magic? Natsu, Gajeel, and Wendy got their magic when they were each taught by a real dragon. Laxus got his dragon slaying magic by having a lacrima implanted into him by his father, Jose. Even Sting and Rogue were taught by dragons. Flare's magic does originate from the Eternal Flame but Atlas Flame's fire is not her own, and she was not: A. Taught by a REAL dragon that's still alive. or B. Had a lacrima implanted into her body. So, she is not a qualified dragon slayer.

She wasn't taught by a dragon that was alive or had a lacrima implanted within her.
My theory is that her hair is like Atlas Flame's scales which was flaming scales or body...

Try HVDC wcs was