Nah, she’s right. Depending on the color you begin with you can be stuck.
For instance if the original color is bright red (like this one for instance, sry have to post it separately, wrong comp :P), the color picker is changing everything but the reddish parts who do stay more or less red. What’s changing is that those red part can become darker and darker, indeed. 🙂
I noticed this is very true with red stuff but I can’t say i tried everything. 🙂