Oh wow. Try replying in the morning when you're less rude and self righteous. A change of taste within an hour? or a condition affecting her eyesight? Why would that condition not affect her consistently?
Anyway, take a look at my follow up reply to the OP. It's funny how you ridicule what I said, and then go on to make the same point. The colours don't change, but perception of them does. Light (and the way it interacts with surrounding materials also) plays a huge part in that.
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That's another factor in perception of the colour. Along with other things that are really personal and hard to be objective about, such as the relative size of the watch (ie, how much you can see on your wrist vs the watch casing). Some of my sports bands just don't go with the plain SS watch at all; the brighter sports bands (like the original green) are so bold that they need to be paired with a muted aluminium finish watch and take all the attention. More muted or darker colours work with the SS watches and allow it's shininess to take centre stage.
The best example of the above is the black sports band. When paired with the space grey it works great. When put with my SS watch, it looks quite classy. When put with my original silver sport, it made it look like a toy watch. Colour affects perceptions of all sorts, including size, shape. etc