The coat color enhancing supp. Use paprika which is a source of copper. It will not change the pigment on the hair that has grown out as that hair is dead. You can start now on upping the organic copper intake and when the new hair grows in it will help feed the pigment.
So it may help get your winter coat dark if you start it now, but don't truly expect a color change until the spring coat comes in.
She should get shinier and slicker on good feed and fatty acids.
I like using dac Yucca instead. It will not test (capsicum) and if you were to try and just add paprika 1) it can get expensive and 2) if you get any that is spicy it can aggravate any ulcers they may have (since it is just dried, ground pepper).
The copper in the dac is chelated, so it will absorb and utilize well.
All of mine are on dac Bloom or dac Oil year-round no matter what and that is expanded upon based on their needs.