Offline music not showing up after iOS 9.2 upgrade
My wife had a very similar problem, ever since upgrading to 9.0. I had to do the following in 9.2 to resolve her issues:


Backup her iPhone.
Wipe and restart her iPhone.
Reload from her backup.
Turn OFF iCloud Music.
Turn ON iCloud Music, selecting "Merge" when warned about deleting or merging the current content on her iPhone.


She can now see and download any content in her library, and make anything she wants available for offline listening.