@Victormg:
I have to agree with the comments opposing your opinion.
She heals WOUNDS that can be treated by PHYSICAL treatment directly.
It is quite extreme but still just physical treatment.
So it is a matter of anatomic knowledge, neccessary tools (sharp surgical knive, etc.) and practical skills.
She does have all that.
Hence she can heal those wounds.
But in order to treat illnesses you need to have the correct medicine.
To get the correct medicine you need the raw materials in enough volume, the knowledge to create the medicine from the raw materials, the tools to create the medicine and the time to create it.
She is missing the raw materials in sufficient amounts right now for most medicines.
Hence she cannot cure the girl right away.
Also if it is an illness that has no known cure then she cannot treat it either until she has the time, raw materials and tools to experiment on some samples to find a cure first.