You don’t need a registered dietician to tell her to cut 500 cal per day from her net daily calories…this will result in 3500 cal per week or 1lb of fat loss per week.
This could be 250 cal per day burned working out and 250 cal per day of less food.
What if any working out is she doing?
How active in her daily life is she?
If you want a more specific breakdown of guidelines leg me know.
There is nothing special about nutrition that would require somebody who has no medical conditions to require a dietician for recommendations.
Clean up the diet reduce saturated fats, no trans fats, pay attention to omega 6 and 3 ratios (ideally a 1:1 is best), cut out sugar (Im not talking about fruit), cut out refined grains, eat complete proteins, eat lots of vegetables. Some people will tell you to stop counting calories…I am not one of them. Track everything that crosses the lips..food, water, gum, whatever.