Toning up.... that phrase make me giggle. Girls say this because think if they lift heavy they will get big. If she is not naturally muscular and big, she won't. I have trained a lot of women with very heavy weight and have NEVER had any of them get too big. Most of them will get smaller since muscle is more compact that fat and the core of the body tightens to support and adapt to the weight and movement.
I wish you would have given more information. Without specific goals it is difficult to help you put something together for her. But here is a rough outline. I personally think a rep range over 12-15 is unwarranted for a beginner. She will see better results and have less soreness with 8-12 reps. Weights 3 days a week. She can start circuit training to learn the movements and eventually expand to free weights. I would chose 3-4 upper body and 3-4 lower body exercises, 2-4 sets at 8-12 reps, at a weight that her last two reps are close or at fatigue. I would start with 2 sets week1, 3 week 2, 4 week 3, If at any time she is having serious soreness that is not gone before her next workout she should not increase the sets that week. At a min she should change up her workouts every 4 weeks.
Another option that many women love are fitness classes. Most of you guys laugh at them, but some of the group exercise weight lifting classes like Body pump are great workouts, fun and motivating. Kickboxing classes are also a great option to combine cardio and movement that builds muscle. I she could sub in a class for one of her weight days a week.