Yes, Sister was right. You need to ask specific questions like:

If I email you, when/how often can I expect a response?

When I am having a crisis that is not an emergency, how do I convey this to you?

etc. I would also tell your T that you are having a hard time getting through in between sessions and discuss it. Maybe she will have some ideas to help you.

Let us know how it goes! You are in my thoughts.