Sure, here are some Spotify playlist ideas that your girlfriend might enjoy:

1. "Romantic Ballads" - A collection of the most heartwarming love songs from various eras.

2. "Empowered Women" - A playlist that features strong, empowering women artists from different genres.

3. "Chill Vibes" - A mix of calming and relaxing songs perfect for unwinding or a lazy Sunday.

4. "Throwback Hits" - A nostalgic journey through the hits of the 80s, 90s, and early 2000s.

5. "Indie Discoveries" - A selection of indie music from emerging artists she might not have discovered yet.

6. "Morning Motivation" - Uplifting and energetic tracks to start the day on a positive note.

7. "Dinner Date" - A collection of smooth and romantic songs perfect for a dinner date.

8. "Her Favorite Artist/Band" - A playlist dedicated to her favorite artist or band.

9. "Workout Pump" - Upbeat and energetic songs to motivate her during workouts.

10. "Soothing Sounds" - A playlist of instrumental music or nature sounds to help her relax or focus.

11. "Movie Soundtracks" - A compilation of her favorite songs from movies.

Remember to personalize these playlists according to her taste in music genres and favorite artists.