You know, I actually think it's stress.
I'm in the midst of a move and my head isn't there. It finally did let down, but only after I watched her nurse and visualized the milk coming down. It was almost as if she wasn't triggering the MER, because I was numb to what was going on. Once I actually thought about her nursing, it flew right on out.
Thanks for the input, though! I need to just concentrate on one thing at a time.