That sucks about being accused of plagiarism! You should definitely go talk to your prof. That happened to me a couple times (and by that I mean 4! times) and it was always so frustrating because it's the equivalent of someone calling you an idiot -and- a cheat. But as soon as I talked to the professors and they realized I wasn't a moron (which is what they assume of everyone) then they dropped it.

There's also a website online (turnitin.com) that you can tell her to go to if she still doesn't believe you.

ps- the nintendo video was awesome. I'm pretty sure that that is the same inner voice I've been hearing (curse words and all) since I started playing video games when I was 4.