She is not the 7th Sister, but I am sure we will see Barris again. She was originally planned to die in the final episode of season 5 of the Clone Wars, but Filoni said they had plans for her, so they changed their minds. Which means there are untold stories about Barris, she will probably return in the Ahsoka show - or in the Bad Batch, since it seems to use some ideas left out from the Clone Wars (like the "Bad Batch on Kashyyyk" plot).

@Swatteam123 Where does it confirm it, because I don't see it on either page

You have a point. It's just a theory I have, and maybe Barris could have faked her death and Ashoka thought she died as well. Maybe Bad Batch Season 2 will show the formation of the Inquisitors, and Ahsoka will find out Barris is the Seventh Sister. I think the plot would be neat if Ahsoka discovered Echo was alive.

^I do agree that it would be awesome to see Ahsoka and Barriss reunite but bringing her back as the 7th Sister would introduce too many plot holes and retcons. How did the 7th sister survive Malachor? Why didn’t they recognize each other in Rebels?

Maybe they fought before Malachor. After all it did say that the Seventh was tasked with hunting down Ahsoka. At the end of the day, I don't care if it can be canon or not. I just pulled it out of the air, and just have it as part of my headcanon.

^Nothing wrong with head canon as I have my own head canon that I go by. Either way an Ahsoka and Barriss reunion would be emotional heavy and I’m definitely all for it.

IF Barris was the 7th Sister she would be one of the most powerful or even the most powerful inquistor and she would be a challenge to Ahsoka and if Barris was the 7th sister Kanan and Ezra might be in one piece

No, I believed this theory at first when it was new but it’s all but debunked. I’m not going to start the Legends Barriss vs Canon Barriss debate again lol but I’ll just posit this. Why would Canon Barriss who despite apparently liking red lightsabers join the Imperial Inquisitorius when she viewed herself as a the last true Jedi? Seems to me the Inquisitorius would be on her list of things that need to go boom.

My goodness, why does this keep popping up? They are female force-sensitives of the same species. That doesn't make them the same person. They don't look the same, and the creators of Rebels have specifically debunked this. And that's not to mention Ahsoka not recognizing her in Rebels, and Bariss, if she's still alive in Rebels would be older than the Seventh Sister. So just no.

It would be cool to see Bariss in Ahsoka, though.