I'm going out on a limb here, but my guess would be that if she is trying to register on the same computer that you use, there could potentially be measures in place to prohibit multiple users/registrations from a common IP address. The same issue would most likely arise if for some reason the two of you share an e-mail address, and one of you has already registered with it. You might get some more concrete answers in tilted support, down at the bottom of the main page.
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