I'm a fan (and you should be too) because...
Kelly is very inspirational and extremely talented. She helps others and myself overcome troubles. Listening to her music lets me know, and I'm sure hundreds more, that you're not the only one going through a tough situation. If it's similar or not, you know you can overcome something bad.
Also, being able to relate helps you connect not just with Kelly, but with other fans. It makes you feel that she's a lost family member you know, but never see (sorry for being so cheesy, haha).
She's very real and down to earth, which I love, she doesn't try to be the best in the business, and I admire her for being the real, open and honest person she is.
I am sure there's a whole heck of a lot I'm missing though, but I've got the basics covered hah