while she was at home I would make sure that the food in the house was nourishing and healthy, she could be addicted to junk and not really eating proper food which would make her continuously hungry, it can become a vicious cycle.
get rid of any junk (biscuits,crisps,chocolate,junky yoghurts, pot desserts) provide fruit and cereals if she is hungry between meals, make sure she eats a decent breakfast, lunch and dinner. she will be growing a lot in the next few years, the right food will improve her mood and her health.
junk food is highly addictive and very unhealthy, so maybe once a week she can have some junk food treats as long as it only makes up a fraction of her diet.