Down to one computer...need help....bad.

I had 2 computers...hers upstairs, mine downstairs. Both had itunes accounts. We both synced our iphones and ipads on our respective computers. Her computer bit the dust. Can't access her hard drive. Decided not to replace, so now we have 1 computer. When I go into itunes I get all of my stuff, which makes sense because it is my itunes. I am trying to figure out how to get her itunes to show up.

I plug in her phone and I can click on the "on this iphone" and see her music, podcasts, etc.......but when I go subscribe her to a podcast she wants, it ends up on MY itunes. Frustrating. How do I get HER itunes to show up so we can buy stuff for HER iphone? This can't be rocket science. I'm sure I am missing some simple element here. I have googled, but can only find info on sharing, etc.

Hasn't anyone lost a computer and had to go down to just using one for both husband and wife's iphone? Maybe the catch is that her computer just died and we don't have access to her stuff on it. So are we doomed?

I appreciate any and all help here.