Hinata has a mother, everyone does. The Anime hasn't mention her by chance. But she was shown in a family picture.
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Hiashi Hyūga the Hyūga clan leader her mother's name is unknown but there is a picture of her here http://naruto.wikia.com/wiki/Hinata_and_Hanabi%27s_Mother
After Naruto beats Neji, he understands that the sub-branch of his family is very important to the whole family and aren't just used as slaves, when that happens, he becomes friends with Hinata.
It's simply called Hinata's theme. It's from Naruto.
Who is Pam Tillis's mother
They never say who Neji's mother is