OK first off, does it have a low oil level warning, or just a low oil pressure light?
Second, if just low oil pressure, how far did it run? Like was she on the freeway and drove to the off ramp a half mile? Or was she sitting in traffic and it came on and she pulled right over?
Engines run on oil film w/o pressure every time y9ou start them up. So they can go some time on residual oil. But not far ...
My bet is the dealer has drained the old oil away now, so there is no way to get a UOA I don't think...
There are lots of places where low oil pressure can affect an engine, especially a modern one. Mostly in the cam and valve train areas. Yeah, she could have hit the rods and mains with enough distance, but maybe not... So even if they drop the pan and pop the caps and check, it may not be the whole story ...
I'd have them put new oil and new filter on it. Fully document what they found when it came in. Have the dealer seal the motor and you'all drive it 1,000 miles, and then they do a UOA. If it comes out high in Fe or Al, or both, they need to look at buying you a motor, or at least doing an in-frame overhaul.
You need to retain an attorney. Be polite, but have all the docs at the attorney so they can help monitor the case. We don't know how this will evolve. The UOA can come out OK and the engine can live for years. It's unknown at this time ...
Do you have a Bureau of Automotive Affairs in your area? We do, and it's an obvious for them. They deal in these sorts of things all the time. But, it you don't have one, you and your attorney will have to carry the ball ...