HI,
THANKS FOR CHOOSING HCM,
try to find out the cause of depression
1.any personal issues which she is failing to discuss with you
2.difficulties in studying and at the college
3.any thing related to the past that has left a very strong impression on her etc.
though it is difficult to find the cause,depression could be completely eliminated only if you can sort out the correct cause
apart from the medication,
counselling and good motivation brings a lot of change
if you depend on medication,after stopping it you need to face the problems of recurrence
so as she is young better go for behavorial therapy
tell her to read inspirational books,watch such movies
encourage her to do
meditation,good exercise
help her by giving good tutions if she has problems in studies
good luck
hope i answered your query
feel free to contact me for further queries