PCLEUSB2_fan:
Happy 4th of July 
Here are my thoughts.
1. You can not overwrite the trial with the full version so you may need to uninstall it first thru control panel > Add/Remove programs(XP) or Programs and Features (Vista).
2. Then clean up the registry using this tool. Run it and choose All products and then clean. Run it again and choose User Registration and Activation data.
3. Then Delete the Pinnacle Folder in C:\Program Files\Pinnacle
Now you can install the Full version.
Eh?
Trial is same as any other Vendor's Trial. When Trial expires, you purchase an Activation Serial No, via Registration. That's all. That's what OP's Daughter wants to do, but can't, because she doesn't have Internet Connection on her PC with S12 Trial..
There has been a way round this re: similar situations. I think the Forum's Pinnacle Rep Marc P has sorted this-one-out, in the past.
S12 Trial is S12 Plus. S12 Ultimate is S12 Plus, but with 3 additional Plugins.
As far as I'm aware S12 Trial is Download only, so how did it get onto OP's Daughter's PC, in the1st place & how has she got the 3 additional Plugins, without purchasing them?
BTW - Since it seems as though there's a new Avid/Pinnacle Video Editing Prog on the horizon, there should be some Retail Outlet bargains for S12 Ultimate boxed Versions on offer, when that's Released..
Maybe I'm missing something here. It wouldn't be the 1st time