Sundae's buckling is now eight days old. Sundae had a very large, tight udder, but this morning we noticed it was very small and squishy. She will not let us milk her (she was letting us before) and walks away sometimes when her kid tries to nurse, which she never did before. Now, it's the middle of the day and I didn't get a good look at her udder, but as of a couple hours ago it was the same as this morning. What could cause this, and why doesn't she like people touching her udder/teats now?