Enchantment by Orson Scott Card
Odd coincidence, my wife just read that this past weekend, after it sitting on our shelf the last 6+ months (we got it from my parent's house, I had apparently read it a decade+ ago, but don't remember the story at all).
She said it's like a fantasy romance, without much sex. Slow to start, but then she got really into it and read the whole thing in basically a day.
I second ORS's Ender series, read up until Ender in Exile or whatever that one was (read like 9 of them or so). Keep in mind the three direct sequels, rather than the parallel novels, are much more adult. The parallel novels, along with the original, are much more young adult.
As far as something to get lost in, I recently read the Tapestry Series by Henry Neff. The first one in the series is called The Hound of Rowan.
One of the most entertaining young adult novels in a long time, and the first one I couldn't put down in quite awhile. 4 of them are out, and the 5th and final one is coming out later this year.
The first one very much mirrors Harry Potter (you will see lots of similarities, including the new clueless first year at the magic school playing the new magical game and somehow being amazing at it), but then the series gets out of that shadow and the 2nd and onward are more creative.
Definitely recommend it to anyone who likes those type of fun reads.