from what you describe is not that severe and its should be a first degree or second degree superficial burn. Neomycin
is sufficient and she might also need a pain killer. Generally, healing in children around non folded areas is very good and effective. Whether it shall leave a scar or nor, cannot be 100 % certain about the answer , but generally in children, healing shall be good and it shall really be rare for an important scar to be left.
Thanks and best regards,