I don't understand 1:56:37/2:56:12 of A Bridge Too Far (1977). I quote this script:

Taxi!

• Do you get all that?
• She wants somebody to call her a taxi. Taxi.

Was this lady mentally ill? How's it possible for a German to shoot her when she just stepped out the front door, but not for the British to shoot back? Was this gunner hidden?

Is there any purpose of this scene? Why didn't someone try to stop this lady from being killed?