Clarrie, I am sure she won't dehydrate herself. When there is no alternative she should drink when she needs to. Have you tried water in the cup? What about a straw cup?

See how you go next week. I was worried about the boys not drinking enough (they would drink from a cup before starting day care, but not much), and they were fine. I was surprised how much they drank when I wasn't there and there was no choice. Hopefully it will be the same for you.

BTW, there is no need for her to drink anything other than EBM at day care if you don't want her to. Jack used to drink some water, but mostly only EBM at day care until after 12 months. Tom is still only drinking EBM and a small amount of water at day care.