Possible interpretation:

So maybe the other woman is the dissociated part of you that's okay with attachment, dare I even say, needs attachment (like every other human on the face of the earth). You can see the the possibility of "this woman" truly connecting with your therapist and delving into your primary relationships with your partner and mother. Then you (as you know you) show up, with all of your compunctions about the impossibility of attachment in the therapeutic relationship, and turn their genuine connection into a financial transaction.

I think the most potent part of the dream is that this made you feel sad--that just maybe the part of you that repels attachment is beginning to feel that as a loss rather than just a needed protection. That your T's face was blurry might point in this direction as well--that you're beginning to doubt your perceptions about who she is and what this relationship is. Perhaps the comforting clarity of your therapist as someone you can discount as "simply another member of the rabble one endures and then dismisses" is breaking down.