User blog comment:Ltmaroon57/Fairy Tail 100 Year Quest, Chapter 4 Review/@comment-29778526-20180810031539/@comment-30338537-20180810091227

I hope Touka won't be a Water Dragon Slayer, there are way too much DS already. Soon they have to start a civil war and teach normal people Dragon Slayer Slayer Magic, just to get rid of all of them.

It could be she was just a normal girl (with a tail, but whatever...) in the town/region targeted by Avatar and she just dismissed the mob of Avatar members as "bandits" from whom she was saved by Natsu. Hence she would know about "Loving" Briar and maybe even have witnessed it first-hand.

I do like the idea of her being an Exceed.