Seems a little hasty! I think she should ask for more bloodwork and a follow up scan in another week. EVEN then, before the d&c if that is what she chooses to do/schedule, I would insist on seeing the ultrasound before they put me under.
if that happened to me, i'd insist on bloodwork and a follow up scan. I'd have to be 100% certain that i'd miscarried before i agreed to a d and c.