Unless she's lying, the actress that plays Tara says she's dead
Maybe she appears in a dream to her mother later on in the season...
http://insidetv.ew.com/2014/06/22/true-blood-season-7-premiere-tara/
ENTERTAINMENT WEEKLY: Did you know Tara would be killed off when you filmed the season 6 finale?
Rutina Wesley: I found out over the hiatus about the end of my journey on the show. [
Laughs]
What was your reaction?
I think it’s great. I think somebody had to go. To have a main character right off the bat go, that’s gonna bring everybody into the show. It’s like, “Okay, and the show has started.” It’s kind of like the catalyst for everything else that’s gonna probably happen—I don’t know what’s gonna happen, because I didn’t read anything else because I want to be surprised. I think it’s kinda cool that the last time you see me, it looks like I’m gonna win the fight, and then you cut to Lettie Mae. Me and that vampire went at it, and unfortunately, he wins. [
Laughs] They’ve given me such an incredible journey on this show that I’ve never had any complaints about what they’ve written for me. So when I found out, I was just like, “Okay, great. Let’s get it started. This is the final season. We can’t all make it to the end.” You wouldn’t have a show. There wouldn’t be any drama. It wouldn’t be
True Blood if somebody didn’t die.