When you are at a land border, but neither country on either side of the border will grant you entry, there is no easy 'way out'.
She could not fly to the UK directly from that border location.
When arrested, she has to go through the proper deportation process - and that might well be very expensive, and she might not have the money to pay. Deportations can easily cost 10x a regular flight cost due to the extra security needed.
> When arrested, she has to go through the proper deportation process
Why? Surely if both the US and the deportee agree that deportation is A-OK then you don't need judges and whatnot involved? Surely having a cop drive her to the airport and make sure she gets on a flight is wildly less work involved for everyone than whatever the fuck is going on now?
She could not fly to the UK directly from that border location.
When arrested, she has to go through the proper deportation process - and that might well be very expensive, and she might not have the money to pay. Deportations can easily cost 10x a regular flight cost due to the extra security needed.