But she needs reliable farm which is difficult in the jungle. You'd have to secure kills and blue for yourself.
The same could be said for the majority of all junglers.
Elise is a really good jungler. She clears fast with plenty of HP left and deals great damage after level 2. What makes her great is that she has 6 abilities at her disposal at level 3 for ganking and even gank successfully against characters with blinks. She can also turret dive to take the final hit with her Repel and still live since the enemy walks a little off their turret in a safe area for Elise to escape turret hits.
The only downside for Elise is her missing her E stun for the gank and that it doesn't go through minions.
She's not bad in the jungle, She doesn't really need a lot of gold as she only needs Sorc Boots and HG to get going. I suppose she's a good pick if you were going double AD and wanted a source of AP damage somewhere but Top Lane is by far and away her best lane.