usually what you would call a female dog but in this contexts no its not its a girl who would most likely have backstabbed you someone you used to be close friends with until they betrayed you now your leftalone that's a bitch it can also be someone you trusted and they told everyone something you didn't want anyone to find out that's what bitch's are
girl 1: she is such a bitch look at her
girl 2: I know I cant believe she backstabbed us like that