I'm sorry that happened.

You get to be the client in this relationship. You get to be the needy one and your therapist gets to be the strong one. That's the way it is set up. I think you should bring it up and expect that she can handle it. If she was close to the person she might get a little emotional, but she would be emotional even if you didn't bring it up. And really that is OK. You won't damage her. And yes, if you are feeling guilt you should bring it with her.