There's something about her powers that I'd like rewritten, and one thing changed entirely. Her Dragon Breath: It's okay if you write that her breath is more powerful than average, but going so far as to say that it's "threefold", or three times as powerful, is a bit too specific and, I'll admit, falls into powerplay. You wrote in the description that she's sleeker and faster, so her raw strength and firepower would suffer from that: less bulk = less muscle, but more speed. 

Then there's her speed: A Dragon can be fast, sure, but the Demons are the ones who thrive in speed and even they would not be able to run/fly several hundred km/h. So while she's fast, fast enough to fly from a slower aircraft, she can't outfly one of the fastest. As for her intellect, she is the same person when she changes, so she's no smarter or dumber. She just has a new body with new abilities, and while her strength and speed may change, she doesn't get smarter. And again, remember, since you go for a sleeker dragon, you'll be giving up strength and a little bit of defense for speed and agility. 

I'm sorry I'm so hard on you, but this is an advanced RP, so there are certain standards :/