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It could be a wrong password as well. Have you tried recover the password?
And no worries about your "sisters" account. There is no policy that do not allow multiple accounts, since there is no real advantage having them.
But before that, try opening origin first, and make sure you don't have caps lock on and are typing the right PW. Also the authentication server can go down from time to time,, but if you tried for a few days and it doesn't work, just call um. They are helpful like that.