Last night I laid EM on the floor to play while I washed K's hair. A few minutes later when I came back she had moved 4 feet diagonally across the carpet to another toy. "Oh my gosh, EM is really mobile." So I moved the toy away from her again and sat to watch her in motion. Nothing. Minutes ticked by, and there she laid flapping about like a beached fish.
So, off I went again to dress K. I come back, and again EM has moved herself across the carpet to reach the toy. So I sit to watch again. Nothing and this time she determined that if I was going to be in the same room with her I should also pick her up.
So EM is mobile, although I haven't actually seen it with my eyes. For all I know she could be blinking, a la Jeannie, to move herself from one spot to another.