AFAIK there are starter boxed sets for:
1. Cyberpunk Edgerunners
2. Alien RPG
3. Fallout RPG
4. Warhammer 40K "Imperium Maledictum"
5. Starfinder
6. Dune RPG
7. Tales from the Loop
8. ....
(By no means exhaustive. I intentionally tried to include only non Fantasy options.)
Also why starter sets, when she already knows D&D and what RPGs are?