D.T.
no not really, the speaking and vocals in the background increases her vocabulary and ability to pick up grammar as well as figure out the meaning of some words by the words used around them.
No honestly, I'm not saying you can watch Springer and Soap Operas all day while she plays but I had the television on from breakfast till bedtime for all my boys and the middle boy is reading 3 grade levels above his age and the oldest was able to develope his own eating regimine to combat ADD without using medication when his dad couldn't afford it. He did the research himself. I recommend PBS and if you're interested in your child picking up 2nd languages then Nick Jr. is wonderful.
If you're really worried about her cognitive development then make sure you read to her or listen to books on tape together for at least 20 minutes a day, everyday.
All three of my boys have had speech delays due to hearing problems the number one thing we were told was to keep reading to them.
But the other thing was to play way more than teach. The kids need to know that you are there to have fun with not frustrate them. Just keep talking, normal talk not baby talk. Describe every thing you do, everything she does, avoid asking questions. Make yourself the sports commentator, she'll learn without feeling pressured then.