Personally, I think that video games and computer games are far worse than TV. We got the Wii and would let our son play and eventually he got obsessed - he would scream and cry when we wouldn't let him play. He is the same way with the computer. We had to make a video game/computer time chart so that he would know when he could play. Now he only gets to play in the morning for a 1/2 hour and in the evening for a 1/2 hour and that's it - no exceptions!
We have a TV in our playroom and it's on almost all day, but the kids rarely just sit and watch it. They are usually playing and just have it on in the background. DD loves Dora, so she will usually stop what she's doing to watch, but honestly I don't think there is ANYTHING wrong with TV especially the educational shows like on Nick Jr. and Sprout. My kids have learned SO MUCH! My 4 year old can count to ten in Spanish, say Hello in Chinese, has known is alphabet since 20 months, counts, spells, etc, etc, etc....
Okay, so I've written a novel, but basically what I want to say is I see nothing wrong with watching TV as long as you are making sure that she is doing other activities during the day as well!!!!!