If she is still actively logging into the site, you might want to look into one of these:

http://www.keyghost.com/USB-Keylogger.htm -- They are [for the most part] operating system independent. Just plug it in, wait for her to log into the site, and retrieve the keyghost afterward. You can do this with software as well, but then you run the risk of anti-virus/anti-malware catching it.