It will be okay. It will all be fine.
If you don't feel ready to talk about it, can you just say 'that thing I asked about, actually I don't feel up to it this session'. I'm sure she will respect that. I find it so hard to talk about too, I had to email t and ask her to bring it up. When she did, I was nearly sick with anxiety. But I think it did help...for a while...