My Nanny used be chatty, warm and eager to see us. She would cook and really go above and beyond. Recently though she has started to become distant and almost monosyllabic in nature. The other day I noticed she was just sitting daydreaming on the sofa, obviously that's fine now and again but it is happening more and more frequently. I tried to bring it up in polite conversation but she just changes the subject before I can properly broach it. At the end of the day I want my old nanny back, she's like a different person. What should I do?