Welcome to the QB from SE Michigan! I am so glad you jumped right in and are enjoying all the fun! I found my teen aged daughters, back in the day, liked things that were two toned like white and black or purple and white. They were more concerned about the colors than the design. I used a good cotton thread to hold the pieces together and that helped a great deal. My youngest daughter returned one of the quilts I made her as a teenage back to me recently for a bit of repair. The quilt is holding but the batting has slipped. I will 'someday' get around to fixing it. Oh did I mention they are both in their mid 40's now so the quilts have lasted about 35+ years.
There is no right or wrong talk to her get an idea on colors ideas and so on then go from there.