She could die in his arms as she had known from their first transfer that she would. Their health was so fragile now that it wouldn't take much of a shock. But she won't release them. She can't release them. She is still bound by a promise.
Tears are finite.
The well of the heart only holds a certain quantity to be doled out in gushes or slowly one at a time. At last they stop, but sobs come from the soul. When finally they too are gone she sits, as she always does, next to the bed and works to get her composure back. She won't fool anyone. The entire House knows what day it is.