I am probably too old to like the word, "Attitude". I wouldn't call the symptoms you described a major attitdue. I'd call it, "Something's wrong with my child, and I don't know what it is."
She's trying to withdraw, and the key is to find out why. And that you won't find simply by turning off the TV. I would try to draw her out if you can, and listen to her. Did this start after something happened at school ? What day did it start, and can you run through that day in your mind to get some clues as to what might have triggered it.
If you are going to take the TV away, take it from yourself, too, and swap it for something like reading books together, even reading them to the blankie, with your arm around her, too. Try to join her world a little, so you can coax her back into yours.
Sometimes something hits us, we hear something, we see something, something happens, and while it may not be a big deal to an adult, something happened that has her mind busy. The trick is to be quietly there for her, and help her to feel safe and ask questions, so she begins to talk to you -- about little things first, but every conversation opens the door and paves the way for the oppotunity to come when she shares what's bothering her.
You can't force any of that, but you can do your best to set an atmosphere where it'll happen.
but to say she has an attitude ? No, she's working on a problem, and needs some support.