Hi Paladin, the reason is that her Username gets automatically signed in, each time you start the messenger. The username and password are stored on your computer and 'Automatically Sign In' option is enabled. Do the following to remove it:\n\n(1) Start Yahoo Messenger\n(2) Press Control D (Both simultaneously). Alternately,  go to messenger menu and then press Sign Out option.\n\nMission Achieved! Now Sign in using your username and password. Hope this answers your query!