Does she get this error message when she doesn't get a log into the forum? If she still gets it and she doesn't log in, the chances are that she has indeed got IP banned and she/you would have to get her to give the moderators her IP so she can get her IP ban uplifted.
At educational areas, you'd find that the IP addresses are static.
If she can still see the forum when she is not logged in, she has been username banned.
I had this issue a couple of times and normally you can simply restart your router, but since I suspect its a static IP, she may aswell contact the mods.
Hopefully this should resolve her issue.
_________________
BACK in London…. For now.
Follow my adventures on twitter: @superboyian
Please feel free to help my aspie friend become a pilot:
https://gofund.me/a9ae45b4