Re: 10 week old suddenly won't nurse??
This does sound like a nursing strike. This link has good information on them, and options for getting baby back to the breast: http://kellymom.com/bf/concerns/child/back-to-breast/. The skin-to-skin and instant reward techniques are said to be particularly helpful.
Since your baby is so young and this is so abrupt, I think it might be a good idea to take her in to the doctor and make sure she's not sick. A stuffy nose or ear infection can sometimes be to blame.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"