After undergoing "prolonged" major surgery, Miss Dove awakens in her room, not in post-op, and no IVs are present. During the surgery, Miss Dove is said to need blood "and lots of it." Apparently, there is no blood bank and only two potential donors standing by to give blood (four pints max).
The principal mixes his sports metaphors. When Miss Dove goes into the hospital, he tells the students their "quarterback" is sick, and he will be "calling the plays," both football metaphors. But the he tells them to "keep on pitching," which is a baseball metaphor.