Hello, greetings from Kolkata.
As per her reports she may have a minimally displaced distal fibula and posterior malleolus fracture.
These types of fractures have a tendency to make the ankle joint unstable. Thus kindly share the xray as well. If the fracture is stable it can be managed by a plaster cast/slab.
Next Steps
kindly share the xray plate picture.
Health Tips
Keep the limb elevated to reduce swelling. Apply cold packs.