Damsel Under Stress by Shanna Swendson
Third book and she and Owen are finally dating -- or trying to, trouble keeps arising. Serious enough that they visit his foster parents for Christmas -- and get called back because of the continuing trouble with Idris. Worse, a fairy godmother has attached herself to Katie and is trying to solve her romantic problems. She knows one of her best friends is having romantic problems because her boyfriend was a frog for a century, but she can't tell the friend about magic. Ari escaped after the last book. And more problems arise.
Don't Hex with Texas by Shanna Swendson
So she headed back to Texas after the events of the last book, to avoid being targeted by the bad guys since they had to realize Owen would save her over catch them.
Doesn't stop things. She survives her family, learns more about them, notices things happening, gets word back to the security gargoyle Sam, and so the trouble continues in the heart of Texas.