This is the type of lighter resistance training that I recommend to get toned without getting bulky. (rachaelattard.com)
I'm not sure what your workout program consists of, but for shorter frames (especially if you are having trouble leaning out your legs), I would recommend very light resistance training for your lower half and focus on exercises to tone your butt rather than bulking up your legs (this means avoiding squats, lunges, and HIIT exercises such as burpees — even though these exercises are great, they will bulk you up). (rachaelattard.com)
To slim down your legs, you really need to do cardio (read more here) and I would recommend lighter resistance training to tone up without getting bigger. (rachaelattard.com)