My iphone won't sync to itunes? - 1

Ok so a few days ago I tried to sync my ipod to my computer so I could add some songs. I plugged it in and nothing happened, it wouldn't even charge the battery. So i played around in the device manager and found that one of the things in the Universal Serial Bus controllers wasn't working. I deleted and re-downloaded the thing and my computer finally recognized my ipod, but itunes still wouldn't. I tried everything until I finally decided to just delete all apple products from my computer. After I had renistalled it synced just fine and everything was working.
But now my mom wants me to add songs to her iphone. When I plug it into my computer and open up itunes it syncs my and my sisters ipod but not the phone. I've tried all the things that worked before and it still won't sync. I really don't want to delete itunes again. Any Suggestions?

You need to add the device to your pc through the advanced options at the top of Itunes or open the home sharing option in Itunes.