MacBook Pro can't connect to WPA2-Entreprise

Hi community,
recently, I got a student who had a strange issue with WPA2-Enterprise network authentication we are using at university. For some reason, her Mac could connect anywhere with any protocol, except in this university. She couldn't test for connectivity in another university using WPA2-Entreprie. The only hint we got is that she had installed Windows previously on that same machine. I suspected a possible former infection of Windows that may ahve triggered some sort of automated ban if her machine was sending spam, but it seems unlikely to me. After the classical PRAM reset and extension-less boot, she had the system clean-installed at the local Apple Store (I specifically asked her not to restore anything), and came back. Her connection held for about an hour, then a timeout occurred, and she wasn't able to reconnect anymore. While she was away, I verified with the net administrator her MAC address wasn't banned. I had her computer booted in target mode, using my own installed Mac on her hardware (we have the same machines), and it worked fine. Reversing roles, her installed Mac OS X version was able to drive my hardware without issues. It doesn't sound like a hardware issue.
I am at a complete loss trying to understand what the issue is. She wanted to buy a new Mac anyways, but I still feel bad about not understanding the source of the machine's issue.
Your ideas?

HI ...
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