Her diet will drive all of her results no matter if she takes clen or does not.
There are a lot of cons to clen... hardening the sack around your heart, burning out your thyroid, you can get arrested for possessing it etc etc.
Have her join and then post in this forum. The best thing she can do is start a journal. In it post what she eats, how much, when etc. Also her routine. Everything she drinks too. That will hold the key to the results she wants. From there the ladies will give her tips and pointers on how to succeed.