Possible Clues:

• Governess expected girl to be back
• Payable to retired woman caretaker
• She has to get the girl up at last safe and sound
• She's there to stop Una and Ned getting too involved with each other
• Governess expected girl's return
• Girl rejected by proper governess in Spain
• Iberian chaperone
• Before retiring woman expected to become a chaperon
• If there's a chap with 'er, one like this has to keep an eye on the girl
• One sees to it that a girl at last is not up to any monkey tricks