観光旅行中に倒れたという外国人女性が救急車で搬入された。大きく呼びかけるとかすかに目を開くが意思の疎通は取れない。同行の友人によると持病があるとのことで，女性のかかりつけ医から預かった手紙を差し出した。

To whom it may concern:

This is to inform you that Ms.●●(Birth Date 3/14/1998) has 21-hydroxylase deficiency. Her condition has been well-controlled with 9 alpha-fludrocortisone and hydrocortisone. Although she does not experience any problems during her daily activities, there is a small but certain possibility that she falls into a state of adrenal failure, especially if she is confronted with severe stress on her week-long trip to Japan.

If she complains of severe fatigue, fever, anorexia, or is found unconscious, please give her intravenous hydrocortisone and sodium-containing fluid, and contact an endocrinologist immediately.

Thank you for your cooperation.

●●, M.D.
●● Clinic

　まず行うべき処置はどれか。