Dengue fever management is by supportive and symptomatic treatment. I would advise you to give her a papaya leaf extract tablets or juice which will help to improve the platelet count and monitor the blood every 2 days. I would advise you to observe her for any bleeding from gums, stools, wound, etc in which case she would need to be taken to the hospital in an emergency situation. Make sure she's well hydrated and the fever will come under control and the condition is definitely treatable and curable.
Next Steps
Follow the steps as advised
Health Tips
If condition persists or worsens visit the ER at the earliest