Fanny is cancer and deserves every bit of nerf possible
As a mage, Fanny is a nightmare. She has ridiculous mobility and and even more ridiculous damage. Not to mention her s2 auto-triggering so you just have to focusing on flying.
Extremely high mobility should not be paired well with high damage. They should return Fanny to her previous state, needing that Blue Buff to enable her to fly around instead of shooting 6 cables without even losing a lot of energy.
What's worse is that pair her with Sea Halberd and Sky Piercer and she'll destroy every hero that's relatively a sitting duck. She annihilates almost a lot of jungles early game as well if she ever decides to invade.
Mind you, I'm talking about Classic. Since there are no bans you'd almost always see a Fanny nowadays. Whenever there's a Fanny in the enemy team, the game becomes less enjoyable.