No, it's all good.
The definition of a Mary Sue is obviously very subjective.
In my opinion, I believe that Sookie can be considered a Mary-Sue because she lacks any significant/notable character flaws or failures...or rather, her character flaws are never acknowledge or addressed (because they aren't meant to be there intentionally).
She's presented as an idealized ~sexy but pure and righteous~ young woman with lots of charm, she is happy-go-lucky despite her sad childhood. She has all the hot boys fighting over her, she is soooo mysteriously irresistible. And for some reason she constantly has the attention and love of almost everyone around her, they are always available to lend her a hand, they are loyal to her, they are fretting about her. And she is always figuring out ways to outsmart everyone, how very competent of her. Oh, look, and she even has cool super powers, too. But don't forget, she's just a regular girl, a mere waitress. Sookie, she's just like us! Oh my. Brb, vomiting.
It's just a bit much for me. I know she's supposed to be the central character, our identification point, but it's like...the story is always [strike]beating us over the head with[/strike] trying to convince us of her awesomeness and her importance but I have yet to see what is exactly so great about her. When you combine that with Sookie's self-righteousness, it get's to be tiring for me. Tbh, I find the characters around her more intriguing and many of them have garnered my admiration and sympathy a lot more than she has because they're more balanced and thus easier to relate to. Yes, even freaky-ass supernatural creatures have been more relatable to me than Sookie.
Just sayin.'
/TL;DR RANT OVER