It would be up to your old T to answer that question; she might think it a conflict of interest and not see you or it would be okay and she would.

If you are having to edit stuff out, it sounds like you are talking too much about the person and not enough about the problem. Make sure you are not just trying to find a substitute for or talk about old-T instead of moving on; when someone dies, the bereaved talks about grieving in therapy, the difficulties of their individual life now, in the present, not about the dead person.