It doesn't matter if she knows about the transference or not. You can talk about it with her. If she's a T, she's aware that transference in general can happen, so she should understand. And it may feel like the pain is just about your T, but if it's transference, then the pain is rooted in something else (maybe your relationship with your parents?) And your T can help you figure that out.

I say this as someone with both some paternal and some erotic transference for my marriage counselor that I opened up to him about a month ago (which was hard, but I'm glad I did it). He's been awesome in understanding and helping me figure out what feelings and past and current experiences are contributing to it. He has kids (and a wife), and I understand that he loves them. But he has said before that you can love countless numbers of people. So because your T loves her children, doesn't mean she can't love you.

Is it possible to leave your T a message right now? Or an e-mail or text? Don't go into everything on the phone, but you could just say you're going through a rough time right now and want to talk if she can. Or you could probably try a crisis line.