I hate to make any recomendations regarding kids. My >>guess<< is that from what you describe she would benefit from the cleanses. I'm sure your biggest tast would be to get her to do them especially the MC.
All these cleanses are not a "cure all" without the commitment to follow up with a healthy diet. If you allow her go back to her old eating paterns/habits she will gain the weight back and perhaps even gain more plus loose any benefits gained.
My real sugestion is that you start educating yourself on healthy diets and start there. The other mayor thing you can do nutrition wise is to get a juicer and start juicing fresh veggies.