Hey Derrek!
Imogen and Ariadne both study Charms, Herbology and Transfiguration together. The two of them are fairly outgoing, and I imagine are the sort to go out together during the holidays. Imogen has pushy disapproving parents, Ariadne has a very easy-going father, but would sympathise as her grandparents are comparable to Imogen's parents.
Did Imogen go on the summer trip? Can I offer you a thread once they're back at school to catch up?