Hey, I understand what you are talking about. However, in my view, I feel being honest while communicating is the best way in any form of relationship,especially when we talk about long lasting(permanent)ones such as family, close friends, siblings, spouses etc. Trust me it helps. Be polite, be compassionate and tell her that too many questions is not really cool. You could put it jokingly too. I do that with my mum!! 🙂 That gives you room to repeat the subtle jokes.
I consider us to be lucky that we have our Moms with us, and there are a zillion unfortunate souls who only wish for having someone that would care as much for them( in anyway possible). May be if U and I keep that in mind as a constant factor, we will find our own subtle ways of striking conversations, or spending time with her. Lets say, doing activities with her such as shopping or watching movies, would involve her participation. That way she might want to talk about how she feels, instead of constantly asking you questions.I may be incorrect, but, from the query posted it seems that the two of you don’t get to spend time together, or give each other company. Give this a shot, lets say once every week step out with her and accompany her for her spa rituals.
Just don’t worry! 🙂