High school softball almost means zero for college recruitment. It's all about travel ball and showcases starting at 14u up through 18u. To play for a travel ball team that is going to play at the level SEC schools recruit from will require a lot of commitment, driving and money. I don't think any of the local organizations play at that level or are on the radar of SEC coaches. Worth Hustle was worth a look. Coached by Marc Weekly, at least it was. I'm not sure if they are still around though, have not seen them on any showcase list this summer.
I would first look into the Fury organization. They are based out of Chattanooga. Several alums playing for SEC schools, including a few at UT. Also look into Frost Falcons from Chattanooga as well. And the Firecrackers have put a few teams in TN, might be worth a look.
Other than that if playing for Tennessee is the goal, you will need to look at some of the Georgia teams like Vipers, Premier, Bullets, Force, Power and Impact, etc SEC has a lot of girls from those Georgia teams.
If she is serious about this I highly encourage you to take a road trip next weekend to Chattanooga and go watch the Scenic City Showcase. One of the premier showcases on the east coast. Check out the website and find where the 14u teams are playing and go watch. Don't be surprised when you see coaches from just about every SEC school, and some ACC, Big 12, Big 10, and even a PAC 12 school or two. And lots and lots of "small schools" as well. Also, know the rules - no talking to coaches. Only travel ball coaches are allowed to talk to the coaches. If a parent or player talks to a coach they will be shown the exit. Even as spectator you are not permitted to walk up to a coach and talk to them. Now if they want to talk to you, that's different.
2016 Scenic City Summer - Connect Sports
check this site out for organizations that kick out ballers:
goldfastpitch
Probably way more info than you wanted, but the travel ball road is a serious commitment.