Diana jungle is pretty much trash... Here are some buffs that may help
As the title says...
jungle is currently sitting at a 48% winrate...
http://champion.gg/champion/Diana/Jungle
Buffs:
Q: Crescent Strike
Minions and monsters are now dealt 300% all ranks.
W: Pale Cascade
After three spheres have detonated,
is healed for 60/80/100/120/140 (20% AP scaling)
Shield refreshing itself removed