Also, consider her diet. Food allergies and intolerances (as well as environmental allergens) can cause poor attention, memory loss and learning difficulties. Gluten and food dyes, as well as sodas, are biggies, but are not the only cluprits. Even foods with bound glutamates, such as tomatoes and peanuts can cause problems. Pesticides and herbicides used on produce, or medicines used in meat and dairy animals can cause problems. Organic foods are better, especially while you are trying to find the cause of her inability to focus. It can take several weeks for the effects of food allergies and intolerances to clear, so don't expect overnight results. Providing lots of fresh, raw fruits and vegetables will help with that, along with drinking only water.