Thank you for your query,
is due to fungal infection
and it should be treated by local anti fungal cream application.
As the growth rate decrease from the end of first year, the appetite will decrease in parallel to the decreased growth rate and they become fussy to eat.
Don't force her to eat but try these :
1. Two spoon method, one to the child and another to the mother
2. Finger foods
3. High chair with a plank at dining table
By this their their autonomy is being accepted and they try to imitate adults and they eat.
Hope I have answered your query.