1. As for the elastic bandage, it is only available in the Burn Plastic Surgery Department of Children's Hospital. This is a special kind of bandage. Even if it is used, it will not be restricted. But do you think these elastic bandages are effective for your niece's scar? Personally, I think this is invalid.
According to your account, your niece's burn should have healed, and the scar began to proliferate. In this case, it is meaningless to smear with hot oil. I have never heard of a prescription that can cure scars by washing the affected area.
3. When the girl is older, she begins to know that she wants to look good. You don't have to say too much. She needs treatment herself. Scars are not incurable. When the child is older, you can go to the plastic surgery department of Children's Hospital for scar treatment, and try to be beautiful without affecting the functional effect (of course, it will not be the same as not being burned).