Psoriasis is an immune disorder. And the child is also shunned by classmates as you say.
When there is depression neglect and immune disorder, it takes time to show results.
For immune disorders it takes more than a year to show significant changes, this is based on my multiple personal experiences.
One should not count the days in healing and leave it to DIVINE.
For this child, you can give GOLDEN SUNRISE BEAUTY SERUM IMMUNE SERUM MOOD UP SERUM BALANCE SERUM
BACH FLOWER REMEDY CRAB APPLE can be given for this unclean feeling remarks from others.
As the child is doing well in classical dance, looks like there are no learning issues. Its a question of her interests. And if in school she is ill treated by classmates, maybe thats what affects her studies.
You can give her SHIELD OF 7 RAYS frequently.
We can give energies with VK, but actions are equally important . In this case as the child is adopted, her guardians or parents can inform the school staff about her fellow classmates troubling her. It is also important to stop the passing remarks in school.
Most of the school staffs generally warn or counsel children to stop such remarks.