A big like I have for our local LQS is, she will hang quilts made by customers. It's nice to see what others in the area are making.
My one disappointment was a class I signed up for. I did not get to choose my fabrics....they were precut, and prepackaged, and not anything I would have chosen. I did purchase the fabric as I really liked the pattern being done. I also paid for what I thought was the course fee. Apparently not....there was another fee for each of the sessions!!! Had I known that, I would not have taken this class. I now have about $250 invested in a quilt that I dont' like, and will likely never finish. I stopped going to the classes as I was not liking the feeling I had each time I went....like I had been "taken". So...be upfront about the TOTAL cost for a class that is more than one session, and let your class attendees pick their own fabrics.
I hope your friend can make a good success of her shop. There has been LOTS of excellent suggestions put forward here!
Patti