I don't know anything about modeling either, but I did find this through the FAQ for new TPF members page, and I always try to refer everyone to it.
http://www.rickykphotography.com/fil...ortraiture.pdf
If you friend is looking to be a model and if you want to shoot for her again, I'd suggest starting to look through different magazines and look at types of shots that she wants. High fashion is very different than commercial. And it something BOTH of you need to do. Yes, as a photographer you will need to help with posing, but she needs to know what a model needs to do and typical types poses/facial expressions.