I can imagine this is very difficult for you. I suspect she was upset not because you interrupted her if this is put of character foe her.

I wonder if she is really struggling. She knitted how hard it is on clients that she is leaving. She is also leaving her career so not only leaving the financial aspect but, also, most therapists care about their clients. Add that to the idea of moving and having a very sick grandchild. I wonder of she is having a difficult time managing all the stress and sadneas.