You don't want to hear this but IMO the best way to protect your files is to use access rights and give the suspicious user only read access.I have heard that. I know it may work. Technically it's not a solution but a workaround : a way to mitigate foobar's lack of functionality on this matter, by using something that has nothing to do with foobar. Not very elegant. But yes, a workaround, so always better than nothing.
Have you read the part where I state that my library is about 6 TB total ?
- Give her a copy of your library.
Another workaround. Which doesn't mean that I won't resort to that eventually. We'll see.
- Setup a simple UPNP server.