Transfer iTunes library to a different account on the same computer?

My mum hates that my siblings and I put all of our music in her iTunes library because we don't have a computer of our own. I just created a new account on her computer (MacBook Pro) for us, but I can't seem to transfer our songs to that account. Every time I try to transfer the songs from my iPhone (same songs as on my mum's iTunes), it says that they've been transferred but the library stays empty. Any suggestions?

Try turning home sharing on. I'm not sure how to do it on a Mac. Either that or take a flash drive, drag and drop your songs to it. Switch accounts. And drag and drop the songs from the flash drive to your itunes