...."That she wonders how I came to be as strong as I am today given all the different aspects of abuse I suffered. It made me immediately go into this I don't think she believes me state."
i think your T, inho, is trying to get you to the feeling level of what happened to you. so she posed that reply about your being as strong as u are today. she is seeking how you have coped with it. sometimes our coping "skills" are avoidance of our feelings. that way we don't have to cope cause we numb it. i feel like yes, she does believe you, she hears you. she's asking your input because she believes you when u tell her something.

"She also told me that when sharing about a memory that I had not told her before that I showed no emotion as opposed to the last time I shared a memory with her. My immediate reaction again was she doesn't believe me."
most times when we share our memories we will exhibit a feeling associated with it...like joy, sadness, anger, happiness. when u showed no emotion about the memory she was asking what were u feeling cause you showed no feelings. she believed you again, but was trying to help you show the feelings/emotions associated with the memory.

" Do you ever feel like you are just telling a story about someone else when you are talking to you T, where no emotion is attached? I find myself doing that. I believe its one of my defense mechanisms because I can't stand being vulnerable. It's extremely difficult for me to trust people."
there's your answer...it's not that she doesn't believe what you are telling, she is not seeing an emotion attached to it. this is where u will need to try to trust your t, imho. your T cares about you and wants to help you help yourself. perhaps it's called a leap of faith when we just go ahead and trust blindly but the rewards of doiing that, jme, were incredibly helpful to me in the end.
hope you'll keep us posted and let us know how the therapy is going. sounds like you're motivated, just reticent...afraid to trust...but you can decide to overcome that so u can get better.