Elise was overnerfed
This is the history of all the Elise nerfs
V4.13: Cocoon -Missile width reduced to 55 from 70. Fixed a bug where Cocoon was providing vision longer than the stun duration (now correctly matches it). Rappel -Rappel now calculates its range from the center of Elise to the center of the target from the edge of Elise to the edge of the target (an approximate increase of 75 range). Range reduced to 750 from 925 (~825 range using the old center-center targeting calculations).
V4.4: Neurotoxin -Base damage reduced to 40 / 75 / 110 / 145 / 180 from 40 / 80 / 120 / 160 / 200. -Max damage to monsters reduced to 50 / 75 / 100 / 125 / 150. Venomous Bite -Base damage reduced to 60 / 100 / 140 / 180 / 220 from 60 / 110 / 160 / 210 / 260. -Max damage to monsters reduced to 50 / 75 / 100 / 125 / 150. Cocoon -Stun duration changed to 1 / 1.25 / 1.5 / 1.75 / 2 seconds from 1.5 at all ranks. Rappel -Cooldown reduced to 26 / 23 / 20 / 17 / 14 seconds from 26 / 24 / 22 / 20 / 18. Spider Form -Spiderlings health changed to 85-390 from 90-260.
V3.10: Spiderlings -Health reduced to 90-260 from 125-550. -Armor increased to 30/50/70/90 from 30 (based on Spider Form rank). -Magic resist increased to 50/70/90/110 from 50 (based on Spider Form rank). -Multi-target damage reduction adjusted to 25% from 10/20/30/40%. -Spiderlings no longer continue taking actions before vanishing once Elise shifts into Human Form. -Spiderlings now group closer together while moving. Volatile Spiderling -Movement speed reduced. Rappel -Elise can no longer descend outside of the indicated area. -Fixed a bug where Elise could begin casting spells and attacking as soon as she began her descent while she was still untargetable. -Spiderlings will now descend from Rappel slightly after Elise instead of descending at the same time.
V3.7: Skittering Frenzy -Ability power ratio increased to 0.04 from 0.02. Spider Form -No longer grants bonus armor and magic resist.
V3.04: Neurotoxin -Cast range reduced to 625 from 650. -Damage reduced to 40/80/120/160/200 from 50/95/140/185/230. Venomous Bite -Damage increased to 60/110/160/210/260 from 50/95/140/185/230.
V3.01: -Neurotoxin -Mana cost increased to 80/85/90/95/100 from 60. Cocoon -Mana cost reduced to 50 from 65.
Essentially, elise's mobility, her tankiness, her damage, her mana costs, her range, her cc and her clear times were all nerfed. They nerfed absolutely everything about this champion, and not lightly. Her spiderlings hp was cut in half, her damage was cut by about 30% and she lost a LOT of reliability in its execution.
Further, the meta in which she was OP has come and gone. It used to be that anyone with health burn was wildly op because every champ in the game was running warmongs (remember zac everyone?). Now, however, health burn isn't really very big of a deal, (especially since they're adding it to a lot of champions, like sejuani, maoki and sion). All of this leads her to the lowest win ratio of any champion (41%).
Objectively, elise is lacking in any strengths that set her apart from other junglers
- Her ganks aren't nearly as strong as several other early pressure junglers. She has barely any cc and her damage isn't as good as champs like lee and khazix. And level 6 adds nothing to her ganks, unlike champs like mumu and hecarim.
- Her clear times are okay, but not as high as other high-clear junglers. She doesn't have issues clearing, but champs like nunu and fiddlesticks will take objectives far better.
- She's not even remotely tanky. She has no innate tankiness.
- She has barely any utility. Her stun is nice, but it's 1 second until late game, and it's her only real utility.
But random buffing wouldn't really help. Elise suffers from a common issue of identity crisis. She is baseline good at everything, and therefore lacks any real weaknesses. Because of that, she's been nerfed so that she doesn't have any real strengths that define her, either. Riot has recently stated that their design focus is in giving champions different niches and making it so that they have clear weaknesses and strengths. Elise currently lacks that, and due to being overnerfed, is barely viable.
TL;DR: Elise needs help.
Upvote and bump if you agree. Thanks for your time.

In her builds so that she has a little cc and I wouldn't call her AOE small...Also the 2 second stun on her e.