This is absolutely correct.. The baby I'd raised was pink and naked when I found it on the ground. It looked like a rat. Even raising it from so young it still could not have been a pet. They get crazy when they mature. They will tear up everything. Including you. They have to be released once they can forage for theirselves.
With mine I just made sure it had easy access to a tray of different things on my porch under a tree. Corn, seeds, fruits, nuts, etc.. After awhile they wont come around as much but will generally stay nearby and take food from your hand if you continue to feed it.
Trying to keep an adult in a cage though?? Not a good idea. Get her a sugar glider if she wants a pet squirrel. They bond strongly with their owner when gotten as babies and handled, and will cling to you all the time.