What does Elise need?
Simple question. Better base damage? Better lategame scaling? Longer CC? Bigger Rappel range? Tankier spiders? etc
Personally I'd like to make her spiderlings tankier as they struggle in the new jungle, and I do wish her Q scaled better in both forms.
's kit is overloaded and is forced to scale terribly, so to make her stronger she needs to have more specialized abilities. Considering she was originally intended to be a mage and an assassin, and feels incredibly satisfying when built as such (when her damage was better, anyway), I think she needs:
, Elise could probably benefit from some kind of combo in between forms that could both gate her power (i.e. you'd need to succeed in one form to succeed in the other) and provide better flow to her kit.