I think I might have counted the hispanic (Josi) and AA (Sierra) in the brunettes, since Marie's hair can be argued as black-ish and Sam's is really dark. (I counted them really late last night so I think I got the numbers wrong as well.)

OK, here's the correct count:
6 blondes
5 brunettes (including hispanic and AA)
1 redhead
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12 dolls.