I found this link on a forum I visited today. I'm wondering how long she will stay white, I know other buffalos have been born white but haven't followed up on color changes. There's a story about the white buffalo woman linked on this page as well, and is well worth reading.
http://www.buffalocrossing.com/index.php3?pageid=20
http://www.buffalocrossing.com/index.php3?pageid=20