I'm really sorry, I would also feel very upset if it seemed like old T didn't really care.

I wonder if it's helpful to think of other possibilities? My T encourages me to do this. So for example, maybe she does care, but another client was suicidal and right at that moment she was waiting for a call from an emergency doctor or someone like that, so she was anxious and a bit distracted. Or, maybe she does care, and she had a note in her voice that sounded like puzzlement because when she realised it was you she was wondering whether you wanted to come back for more sessions, and thinking through whether it would work with her schedule.

I hope your new T is nice, and will be kind and understanding if you tell her about what happened and how it made you upset. I would be upset too.