You obviously havent play with scy
<3
i will describe for you an actual match with scy:
oh fuck we're losing bot and mid hard an- wait, they surrendered, wtf? WTF 9-0 ELISE?!
"wtf, when did we take all the top lane towers?" Elise tower pushing op.
Don't forget my occasional "Down 10 kills, dunno if we're going to win this" calls that lead to bind saying "HAVE FAITH SCY" before we get like two or three aces in a row and then Rex builds Rageblade to celebrate the sudden 5k gold we all made.
that's good elise vs. jax analysis
Jax was one of the first that straight up showed me how to beat back an Elise: Trade with her and abuse her bad sustain. Jax's jumping in and just going beastly on me or Wukong's dash in/stealth out harass are like my two most feared match ups. I've learned how to deal with Jax for the most part (bait jump ins and escape or mid-air stuns) but Wukong I still screw up my stun with (so many stunned decoys >>). Besides that, Nidalee is kind of an annoyance as well but I think that's just being sloppy vs their heal.
Irelia is a hard one to say since I don't think I've played against too many that I'd argue really did the match up well. No Flash E engages (for the stun at 100% Health rather than Q) into perfect ults to heal up (e.g., reposition to hit minions too instead of just me). Wickd's Wit's End / Ionic Spark build really does a number vs Elise as well but all I see are rushed TFs instead of building to counter. But, there's really no trick I can think of for vs Irelia. Just try to safely Human Q harass. If you can, zone her from the minion line so you have the Rappel backward option. Always respect her damage output during a stun.
Olaf just can't do anything if he can't get close enough to Reckless Swing. So if you can dodge his axe, you've basically won the match up. He does have a scary melee presence, though, so it's good to be wary about him winning the fight when you all-in him, even if you have far more health left than him. There's not really anything special to do to outplay an Olaf, though. Just normal things except he has a "get out of stun" card that you need to adjust for (e.g., save Rappel to chase him rather than to engage). Dodge Axe, stay out of Reckless Swing range, respect his low health damage output.
Basically, just respect both Irelia and Olaf's ability to turn what looks like a kill for you into them barely scraping by and try to use Rappel smartly.
Other notable thing for Elise is enemies aren't safe under turret from her. It's really easy to Human Q, Spider Q, Rappel, Spider Q when you land. That's a ~40% damage dive right there basically. You can even cheese the turret a bit if your minions all die when you Rappel. If you let Rappel time out, the spiderlings land BEFORE Elise does so the turret starts shooting them, not you. Easy way to land and wait a second (or more, depending on how many spiderlings you have to sacrifice) for her cooldowns if you need it or to just land and walk away without taking any damage. Can even switch back to human form while turret shot is in mid-air to save the Spiderling too if you want.