Well... at least not in any significant way. It honestly appears to be a lot of over-reacting and jumping onto the "nerf this, then that, and everything" bandwagan. Her thistles moderate damage is countered with the slow firerate, and the homing attribute really isn't that good and is necessary due to the slow projectile speed of the thistles. You could also view this attribute as no different then splash damage. It's more then likely she has a very similar time to kill (and overall lethality) as any other class in the game. She, or her abilities, are not any more powerful then any other classes (especially when compared to all the really powerful zombies).
But, if she absolutely had to be nerfed; i'd suggest taking a look at more 'alternative' tweaks such as reducing her total health, a smaller radius for the Time Snare ability, or reduce the already insignificant time you can take the reticle off target before losing the lock of the homing attribute. Rose doesn't need to be nerfed into the ground and become no more then a stupid, worthless 'support class' like the Sunflower has been for years.
I understand that a lot of you may disagree with me but there must be some who agree?
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A general reply to comments so far:
I do notice quite a lot more Roses while playing Turf Takeover gametypes, then in others such as Team Vanquish. An indication she's more effective (thus more common) in those gametypes due to factors such as the higher concentration of players in a single location, etc.
As for those claiming she actually has a quick firerate; go compare it (using the ammo count on the HUD) to other classes (and their variants) and you'll see that's just not the case. And if you also went ahead and tested out the homing attribute you'd also see it really isn't that good (as you obviously believe).
🙂