Little concerned

Hi,  I just purchased a shih tzu maltese mix.  Her nose is gun metal, eyes are light grey and she has shed much of her newborn coat (she is 11 weeks old).  She looks like she has bald spots, but hair is growing back.  Her hair appears black until she is in sun and it looks more dark grey.  The new hair is lighter.  Will her hair grow in good?  She is perfectly healthy and seems to be very smart.  She is affectionate and playful.  Should I be concerned?  I was told she couldn't be a blue because she is mixed, but everything points to otherwise.

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