Hi dear I can help you out plz let me know in detail what you have been giving her since 6 months. If you are just feeding her breast milk then it's OK she has gain weight.
Now from 6 month onwards you can start some fruits juice with milk and vegetables soup. Later you can also start with rawa, ragi thin porridge. This will give her good energy and no extra weight gain.
Next Steps
I would recommend you that meet an expert in personal.