I agree with the advice you have received, she could very well be trying to shift focus. However, she is an adult, and if she is asking for information directly, you should not feel the need to shield or protect her. I would answer her questions honestly. You needn't make it a huge conversation or go into details. But refusing to tell her is treating her as a child in a sense, and she is not a child. It is not as if you are forcing the information upon her; she has asked you, and so to be respectful to her, I believe you should answer. If it upsets her, she can deal with the consequences of that, as she is the one who asked in the first place.