I'm in the process of selling my MBP and I'm going to live with my iPhone 4 and iPad as my only computing devices for a good month or two. The iPad 2 can be used as a sole computer. But if she wants to put movies, music, etc. on it, then she needs another computer (desktop, notebook) to do so and install iTunes. The iPad is not a full computer, it's a limited one. There's no user accessible filesystem unless she jailbreaks, which requires access to a computer. Also, she can't update to a newer version of iOS without a computer.
If your friend can store her files on the cloud or email, the iPad will work wonderfully. It's basically a computer, but no internal user accessible filesystem. I think if Apple allowed people to read/write to/from peripherals like flash drives and external hard drives, the iPad (iOS 5? 6?) will replace cheaper computers (aka Windows PCs). That's the only thing that prevents people from using their iPad like they do with their current computer, that it needs to sync with another computer with iTunes to update the OS and manage multimedia content.
If your friend can store her files on the cloud or email, the iPad will work wonderfully. It's basically a computer, but no internal user accessible filesystem. I think if Apple allowed people to read/write to/from peripherals like flash drives and external hard drives, the iPad (iOS 5? 6?) will replace cheaper computers (aka Windows PCs). That's the only thing that prevents people from using their iPad like they do with their current computer, that it needs to sync with another computer with iTunes to update the OS and manage multimedia content.