Also talked to trainer who has Scout today. . .apparently she has laid down on him several times when he backs her up. She has done this to me twice, my assumption was that she is lazy and it was an odd quirk of hers. It is not a tantrum and very undramatic, she just simply folds.
It appears that this strange quirk may instead be one of several symptoms of mild EPM. So it looks as though I will be going to pick her up this weekend :(.