Hi, so if you want to play her. Refer to this guide

Go solo top, Fiora can stand alon with a Cloth Armor and 5 potions + her passive, which gives her health regen every attack, and last hit as much as you can, after you get Tiamat it's easy farming, that time your farming starts to increase.

So if you think your enemies are already ganking you, put wards in bushes with your Wriggles Lantern, place the ward near Baron if you're Solo top, ask your jungler to help you.

Wait for the enemy to overpush himself, tell your teammate to let him push, that time when he reaches the tower that's the dangerous point of him, approach quickly with lunge, put if he flashes, Lunge again and put Exhaust on him, that way, your teammate can diable the enemy for a secure kill.

You get 2 Tiamats and 2 Bloodthirster(if you can get alot of CS(creep score)) Start joining teamfights. Start the clash using Lunge, save the second cast if the enemy is running away. Use Burst of Speed if you think you can get a kill. Third, use your Ultimate if they are sticking together, use it for the purpose of the 2 Tiamats. With the 2 Tiamats your ultimate deals double damage. If you have enough money to buy Tri-force. Buy it right away, and save up of the Infinity Edge.

Say to your teammate that this will be the last clash and destroy the Nexus. Until your enemy will be all dead, rush to the Nexus, if the creeps are very far, ask your tank to dive everything, that way, you have very high damage, you can destroy a tower in 5 seconds.

Thank you for reading it, this is my first time so do not expect much, and I have limited time, I will edit this guide as soon as every time. Thanks! Note: I'm not that good in English because I am only 11 years old and I am Filipino so don't expect much. So by the way, THANKS for reading this guide!