You do seem to be taking on all the responsibility for this Yearning. I'm not T-bashing and i realise we don't know all the details of your therapist/client relationship but it seems to me that maybe she's not meeting some needs you have and as a result you're trying to deny they exist.

Being needy or dependent or vulnerable is ok and especially in therapy. I wonder if you began to feel safe when she responded to you outside of therapy previously, that her taking time for you proved her cared for you and that she was a trustworthy person, it helped cement the bond and her reaction the other day was more distant and rejecting, like she was saying that she wasn't going to be that person for you. Maybe you're feeling a bit cheated? Like she's rejecting you.