Whether I download all my purchases or one at a time, for some reason it keeps cancelling the download. Even when completed, it finishes with "cannot download at this time." Is this a known problem or is it because she hasn't upgraded to 8.1?
Had the same issue with an app my wife was trying to download that I had installed on my phone. Had to turn off family share.
I had issues with downloading apps.
Log out of the itunes account on her phone, reboot and log back in and try again.