Sarabi barely gets any screen time, but her role as a nurturing, motherly presence shouldn't be ignored. She is, after all, the lioness who gave birth to the future king of the Pride Lands. And, she's been through a lot: the deaths of her husband and son, Scar's reign of terror, the surprise return of her son, and the birth of her grandson. She is very much a force of good in The Lion King.
Like her husband and son, she's loyal to her family and the animal kingdom. She's a tender and loving mother, but she's also willing to fight evil whenever she has the chance. Come to think of it—someone should make Sarabi: Queen of the Pride Lands. Are you listening, Disney?