Unless things change rapidly in the next few days, I've pretty much decided to take Calliope to the pediatrician over the Christmas break to discuss her rapidly shrinking diet, and to explore the idea of a feeding evaluation. She is eating only a handful of foods now. Really, peanut butter, crackers, and dry Cheerios are not the mainstays of a healthy diet. (She also eats yogurt with the nanny, though not with me, and occasionally a little cheese. Plus she's still nursing, though not a lot.) The nanny and I keep a notebook with what food she's eating, and we also sometimes record what we have offered. So I think that will be useful.
But basically, the situation is stressing me out, and I need someone else to either tell me, hey, she's fine, don't worry about it, or alternatively, yes, there's a problem, and here's the solution.
I'm not so worried about her weight per se -- though I don't think she's gained any weight in the last month, I also don't think she will starve herself -- but more about the stress of meal times for me, and why it is she won't eat. Why she's lost interest in fruits and vegetables and bread.