Why not just buy her the Onkyo 8255 or HK 3380 receiver and find a used Oppo 980 or 981 and then a pair of nice speakers. The Hk will have a warmer sound which might be better for a budget system.

http://www.amazon.com/dp/B001AMSPQI/...l_36pksyfn9i_e

Inexpensive and good sound. Put most of the money to the speakers. It sounds like she really enjoyed your system and getting some nice speakers with a decent inexpensive receiver and CD player will give her the best possible sound for less money.