Home sharing, sharing playlists

Our familiy music collection is on my iMac.

Home sharing is set up.

We use playlists.

My kid can sync her iPhone 4S using playlists to get any music she wants off the iMac.

I can do the same with my iPhone 4S.

My wife has a Dell laptop she uses for her iTunes account.

She travels and likes to download movies for her trips.

She has some music on her laptop in iTunes.

She just got an iPhone 4S and wants more music from our iMac.

With home sharing (we get the music sharing icon) she can stream a playlist she created on the iMac but I can't seem to get that up on her iPhone.

She wants to use iTunes to get movies on her laptop but use the iMac to get music(a single playlist) to her iPhone 4S.

Can this be done?

3 people, 3 iTunes accounts, 3 iPhone 4S, an iMac, and a PC Laptop.

Thanks in advance for any asistance.