Answer to Question 1
If it's nice out, Jamey and her mother could go out for a walk in the evenings.
Ininclement weather, Jamey and her mother could play the latest motion video game.
Find organized physical activity/sport for Jamey (social/accountability aspect may enhance interest)
Answer to Question 2
Snacks between meals are acceptable as long as they are healthy snacks.
Fruits and vegetables would be ideal.
Foods with mix of protein, carbs, fat, and fiber may help prolong satiety
Portion control for snacking
Instead of using dessert as a reward, Jamey's mother should offer to do some kind of activity like going to the park or shopping with heranything that will encourage physical activity.