Karin has an infatuation, and a dangerous love, as the databooks put it. Its not the same as love.Yeah, she really doesn't care for the person who saved her life a couple times. Seriously, she'd do anything for him just like Hinata would for Naruto. Karin sure really didn't love him enough to fight her way to get to him and activate her chains for the first time (that we know of). She even tried to protect him from Danzo, but got kicked away pretty easily iirc. Basically how it's going so far is
Hinata loves Naruto
Karin loves Sasuke
Sakura make up your god damn mind already.
Karin / sasuke helping each other doesn't show they love each other, since Neji died for Naruto, jugo risks his life for sasuke, and gai is willing to die for lee. There is nothing romantic in protecting a friend. Its possible for a female to show concern for a male without wanting there D, just saying... Kinda like with that whole CPR issue...