My daughter complained that her eye was hurting all day yesterday. I didn't see anything wrong with it. This morning she woke up with a black eye and blood on the eye itself. I think this is a busted blood vessel. I was told this will go away on its own but I was wondering if I needed to take her to the ER or make a doctor's appointment. Just wondering what I should do.

Take her to the ER. RIGHT NOW.

Really? You're here asking if you should take her to the ER? An unexplained black eye with blood on the eye itself and you are typing into a box on a website asking if she needs to see a professional about this...

Get off the computer and get to the ER.