That your D12 was willing to answer the therapist is really a good sign.
I have a D18 and at times I would describe her as not saying $hit if she had a mouthful. She was in a counseling session with her sister (D16) once or twice and never spoke a word.
My point. Your daughter talking and crying, as hard as it is to see, is a good thing.
When my H was still at home and did the distance thing, i would just go on about my business. If at all possible in another room. If not I would either listen to music or humm.