You only lose your free pathing if the enemy has sight, which to me means that you have to be more mindful of your positioning. That is, unless vision from creeps breaks the pathing too, since they see through the fog of war. But for heroes all you have to do is stay near a open spot in the trees, break vision, and bail.
I agree with Zaphid that she is pretty out of place in the current meta though.
Also, WTF is up with reversing the effects on earth spirits abilities? That's gonna fuck with some folks' muscle memory, haha.