wait till dinner, put her on one side of the door, show her you pushing the food bowl through the door and leave it on the other side. Don't tape the door up, just let her work it out. Make it a high value dinner with some extra tasty-ness in it.
Hunter, USA trial helper, Charleston Working Dog Club Training Helper/Training Director
Beschützer des Jägers v. Sportwaffen, HOT, IPO1, AD, CGC
Katya v. Hügelblick, HOT, IPO2, CGC
SG Aska v. Ketscher Wald, 2 x SchH3, Kkl 1