perhaps it's a simple case of being too afraid/ even unsure on how to word it

I know it's one thing I tend to do when I get anxious.. rather than admit I'm anxious, ignore the questions, ignore the situation because I dohn't know how to aproach it

or perhaps she feels that you're all ready going through too much, and what she has to say isn't really important or worth troubling you with

all you can do is be their for her

she'll talk when she's ready I'm sure