User blog comment:Leek0421/The strongest Female Fairy Tail wizard/@comment-7418318-20150512084335

I think right now is a pretty bad moment to judge.

Of all the females we only really saw Lucy and Wendy (thought to a lesser degree) had the chance to show us how much they improved during the one year.

We know that Juvia trained for half a year, with the other half spent lamening over Gray's departure, but the only result of this training we were shown was that she stripps before battle.

Erza was fighting small-fry so it's hard to judge if she improved at all.

And the other women weren't shown at all.

Especially with Cana I have trouble predicting anything. One on hand she does have this how "Gildart's daugther" and "great potential" going for her, but on the other hand she is quite lazy. In extreme cases her laziness might have won out, leaving her exactly the same as she was pre-timeskip or she might have realized her true potential and risen to be on equal terms to Mirajane or Erza.

While I doubt it is going to be either of those extremes, there's still a huge gap in between them into which her actual level can fall, making it next to impossible for me to make even a good guess.