Point out the areas she does well in, to get her started. Communicate regularly and individually, with each child. Let her know you're interested in her interests by asking questions and listening to their responses. If one child is presenting with problematic behavious, deal with him privately. Then make a plan with the child to deal with it proactively.
Family meetings are a preemptive way to resolve crises before they begin.
The meetings can happen at a set time, or around the supper table one night a week. For eample, if you note an increasing trend in name calling, you can dismiss the impact of negative comments and how they detrimentally affect the whole family. Remember to always finish the meeting with encouragement. Encourage healthy friendships with your child's peers. Despite the mess and disorganization, let it be your home that they want to come to after school.