If this is her first time, I recommend her either Northern Lights or maybe even Blueberry. They are both rather forgiving. Blueberry and Northern Lights are both acceptably potent, but Blueberry is, in my opinion, FAR more potent than NL, but NL typically has a larger yield. I have experience in both, but I have not entirely grown either (I have, however, done maintenance on some of them, and saved some from death.)