since you do not indicate her height, a reference to her weight is ambiguous. To translate for the metrically challenged: 55 kg is about 121 lbs, 60 kg is about 132 lbs. That means that, unless she is very short, her weight may even register as ‘normal’ on some standards.
That would mean that she should not just look at fat loss but at building muscle through a combination of exercise and diet.
The Chilean food may be heavy but I do not believe that anybody forces her to eat it. Maybe some home-cooking and otherwise smaller portion may be a good idea.