Quote: to say that I would prefer not to talk about it while I'm at work, it is too emotionally draining on me. If she wants to talk about these things I ask she call me while I'm not at work.
I don't think that's too much to ask, as long as its delivered as a response to her actually calling you at work to discuss these things, as long as you deliver this reponse in a caring way, maybe as a request. I wouldn't set too many boundaries on when she can talk to you about this: just say that while you are at work is not a good time, and to ask if there another time that's better for her, better for the both of you...