Flight cancelled, can’t get my luggage

My kid sat on the tarmac at Dulles for almost 5 hours last night. Flight was rescheduled for 10am and then around 2am it was canceled. A direct flight 10hr has now become a series of flights - 16 hours and 2 layovers leaving tomorrow. She has been in the airport since 3pm yesterday. Zero help getting her luggage. It’s on a ramp. We can’t track it. All they say is that she will text when it hits the carousel. She can’t even go to the hotel we had to book because she needs her bag. Anyone deal with this?