I have to ask, why do people pick nidalee jg?
Especially in lower elos where people dont know dirt about strategy or objectives, the usual picks for jg are Jax, Sejuani, lee sin, Master yi, zin zhao, nocturne, reksai.
I cant think in any of these situations of nidalee having a chance.

or something like that, a Yi will be hard pressed to kill her even with full pen. I just don't see him taking her down at all. If she hits a long range Q on him, turns into cougar but waits for him to Q before jumping in and finishing him off cougar WEQ, he's dead or almost. If he decides to heal while she's trying to kill him, she can switch back, heal herself, back up a bit, then spear and combo again.