Abby you seem very well spoken on this - at least in print and I am like that too - we had such a HUGE "don't tell" rule at home that none of us kids could ever feel that we had the right to speak out, no matter how bad things got... and I am still like that today... I just get silent but the rage goes on inside...
Don't let it eat you up... i was thinking that maybe you could take this post to yr T and read it to her - not from top to bottom, but one sentence, and force her to respond, if I can put it that way, and get your response out too, before you read the next line. I really think this could guide the two of you through some very complicated areas.
Hope it's helpful. I am sorry things hurt so much. For what it's worth, even being able to articulate your feelings here is probably due to some healing on your part. Before that you might not have been able to find the words for the hurt?