Here are some tips from an actual fencer for Fiora (Rioters please read)(upvote plz)
First off I like what was done with Fiora, making her more 1v1 based was a good idea since she is a fencer. Most of the Fiora rework is fine except some certain things that seem invalid to her weapon. She is using a rapier which is basically an Epee. But her basic attacks look as if she has a sabre in her hand. Rapiers and the Epee are point based weapons so her basic attacks should reflect this. Understanding that it is a game not everything needs to be precise but at least make an attempt. Secondly Her passive 1. takes to long to show up as a visible target after she hits the first on 2. her passive isn't easy enough to see during a fight( not sure if its too small, or just not visible enough, or both) aside from those 2 points about her passive showing weaknesses that she can exploit that seems pretty accurate.
Brief review: 1.Make her basic attacks show the thrusting point control based attacks of her weapons(she doesn't have a Sabre)
2.Make her passive easier to see(when you get close to them it gets hard to see it, especially on tanks)