Honestly this meta sucks for her.
She's all about poking people down by spamming spears; but when tanks just shrug off her Q like toothpicks, she can't do much if she doesn't get a massive lead early game.
As for mobility: Kassadin has the best mobility in the game (I would argue that Riven's mobility is also bs but that's for another thread on another day). Unfortunately he's been 'balanced' around it (horribly nerfed so he can keep that much mobility).
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The only REAL problem with Nidalee is how little mana she uses as cougar form costs no mana and the fact she can keep throwing spears at you if you try to recall permanently trapping you in lane. Also her spear does 150 damage level 1 rank 1 so thats also balanced. And thats halfway range.
Halfway? Bud that's at max range. What are you doing getting hit by a max range spear past buying boots?