I'll defer any question regarding the elk to those that know.
However, if all else fails I tend to take the DIY approach. Have the alarm set as instant and have a door bell button at the backdoor that activates a time delay relay with the contact wired in parallel with the door contact. She pushes the button, the contact closes, she can open the door until whatever time delay is set in the relay. If she closes the door the TDR times out, the contacts opens and puts the door contact back inline.
However, if all else fails I tend to take the DIY approach. Have the alarm set as instant and have a door bell button at the backdoor that activates a time delay relay with the contact wired in parallel with the door contact. She pushes the button, the contact closes, she can open the door until whatever time delay is set in the relay. If she closes the door the TDR times out, the contacts opens and puts the door contact back inline.