No problem Sis, but....the greys and muted bluish green tones are what may not work as well as she would like in metallic. Browns work great!

Metallic can also make certain skin tones look odd, but not all of them.

That is why it really is a good idea to order a small version (though small prints in metallic are much more expensive than small prints on regular e surface paper) and see if it prints as she would like.
A lot of white or greyish tones can look odd in metallic.