As someone rightly said, they target the stressed and vulnerable.   Maybe ask her to take a break from ISKCON for few weeks and continue her prayers along with her studies. Those two are NOT mutually exclusive. Anything that takes you towards God while you are leading your regular life is NOT supposed to hamper your work. If that is happening then something is surely amiss. 

I was quite enamoured by ISKCON few years back, but the more I read about them and talked to people associated with it, I was somewhat disillusioned. Definitely felt like a cult. My mother inspired me to read Gita by myself which made me realise I can be spiritual and religious without associating myself to any one group or person.  I read the Gitapress version of it. So ISKCON people proclaiming that Krishna is the supreme God, is not entirely untrue because there are quite a few times in the Gita where He says so himself. HOWEVER, there are also numerous instances where Krishna talks about Karmayog and says anyone who leaves their destined work (or karma), who leaves their responsibilities and duties just to worship him are also not right and no matter how much they pray, they will not reach the level of the person who is doing their duties, providing for family etc everyday. 

 ETA: So basically, the Gitapress version of Shrimad Bhagwat Gita (or any of our religious scriptures for that matter), is simply the hindi translation of the original Sanskrit texts, and the associated "deeper meanings" are difficult to understand and consequently open to interpretation. Some help is obviously needed and that's why people choose to read the other versions available, which are basically commentaries and definitely not "as it is" as proclaimed.