First, I would provide her with good material. Cheap crayons and markers do not satisfy the need of a child. A good set of crayons should have polychromatic colours like Umbra, Siena, Ocre. Monochromatic colours like Cadmium-Yellow and -Orange or signal-Red are artificial and do not appear in nature, and such colour experiences can distort the perception of a young one.
People say that children like colours. This is correct, but nobody cares about the nature and the quality of those colours. It took me about 20 years to distinguish between different kinds of colours, because as a child I was spoiled with those artificial crayons and markers, and it lasted that long until I un-learned all the wrong stuff.
I don't know if the brand Caran d'Ache is available in your area, but as it is a local factory at where I live, Caran d'Ache is synonymous for good quality colour crayons. Every child that shows some skills finds a set of Caran d'Ache under the Christmas tree someday.
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http://www.carandache.ch/products/fineart/index.lbl
There are better manufacturers, but Caran d'Ache is widely spread and still quite good. They have also artificial colours, but most are natural and polychromatic. The real good stuff you get from Artemis, Auro, Heidelberger Naturfarben and other small manufacturers. Difficult to find by the way, but I think it is sufficient for your daughter when you buy her material that is just not too cheap.
The teaching itself is mostly not necessary, as the children discover things for themselves. Sometimes it is even better not to tell them how to do things, and let them discover it. I would avoid prefab children paint books where the children get degradated of only filling out fields. A blank sheet of paper lets them more room for their enormous creativity.
Hope she has fun with drawing and painting.