I would look for a country classics greatest hits cd with a variety of country entertainers. Maybe a three disc set so she has a good selection to listen to.
Ultimate Classic Country Collection
1. I Fall to Pieces - Patsy Cline
2. I Walk the Line - Johnny Cash
3. On the Road Again - Willie Nelson
4. El Paso - Marty Robbins
5. Forever and Ever, Amen - Randy Travis
6. He Stopped Loving Her Today - George Jones
7. Make the World Go Away - Eddy Arnold
8. Hello Darlin' - Conway Twitty
9. Okie From Muskogee - Merle Haggard
10. He'll Have to Go - Jim Reeves
11. Luckenbach, Texas - Waylon Jennings
12. I'm Movin' On - Hank Snow
13. King of the Road - Roger Miller
14. I Will Always Love You - Dolly Parton
15. Act Naturally - Buck Owens
16. Rhinestone Cowboy - Glen Campbell
17. Sweet Dreams - Emmylou Harris
18. Don't It Make My Brown Eyes Blue - Crystal Gayle
19. Flowers on the Wall - The Statler Brothers
20. Streets of Bakersfield - Dwight Yoakam/Buck Owens
21. Young Love - Sonny James
22. Wing of a Dove - Ferlin Husky
23. Heaven's Just a Sin Away - The Kendalls
24. Hello Walls - Faron Young
25. For the Good Times - Ray Price
26. I Love a Rainy Night - Eddie Rabbitt