B.F.
I had a 19 yr old at University in Russia. We could Skype anytime. I would not let my child go Anywhere I could not communicate with her. Who on Earth would ask that of anyone much less a child? Would you go away from home for 6 weeks and not communicate with anyone, even if you didn't have responsibilities?
What if she were in an accident or just had a problem? What if she left her card at a store? Yes, it happened. What if there were personal issues?
That's way, way too much to ask. There will be other oportunitines.