You kind of answered your won question...--> take her off the guest network and add her to the main network.
Usually, the way it works is the guest wireless network only has internet access, and can't see each other's network shared folders. They also don't have access to networked printers, etc.
Connect her to the main wireless network and enable "File and Print Sharing". Also, choose the network to be "Private Network". The main wireless network should have access to your wired network, they are usually configured to be visible to each other by default.
Once she is connected to the main network, and her "File and Print Sharing" is turned on, in Windows Explorer you should be able to see her computer name under "Network". You can also right-click on certain folders and choose "Sharing" to make them visible on your local network. You can also share printers, etc.
Just ask if you get stuck.
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