First off, great job for trying to improve your health and eating healthy!
Weight loss really comes down to calories in and calories out. Eating healthy is a good start but for weight loss, how many calories we consume at the end of the day is what really matters.
If you have not tried calorie counting, I would recommend a food journal to keep track of your daily caloric intake. I usually recommend between 1200-1500 calories a day for women for weight loss, depending on their circumstances.
If you have tried the lower range and are still not losing weight, then I would evaluate your exercise routine. Start exercising if you have not, and if you exercise now, I would make sure that your workout is hard and challenging enough.
Best wishes to you and your daughter!