Hi,
You are right - your milk doesn't just dry up. It sounds like she is unwell and miserable at the moment. What are pooey nappies like? At this age she will be eating food and drinking water as well, how is that all going? Is she off her food a bit? It's pretty normal for your books to be just solf and normal all the time. No chance you can be pregnant? Have you got your period yet? (No, your period doesn't dry up your milk supply, either, but can make your baby a bit fussy. Pregnancy is one of the very few things that will impact on your milk supply. Keep doing what you are doing - give her a few days and generally it all sorts out and you get a better idea of the pattern