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[Euchre]

That woman seen in the window during the helicopter takeoff is Lily. That's her dress, the same seen during the party. As to the whereabouts of Beth - I think she left the party early ( I have my reasons... ).

There are indeed 4 helicopters in that shot at 1:37:
1. on the left on the ground
2. on the right on the ground
3. in the air in the foreground and lower
4. in the air in the background and higher
Chopper #3 momentarily blocks the view of #4.