krazibean,
Your T's email about the money has nothing to do with how much she cares about you. She probably doesn't make enough money to employ a bookkeeper so has to seek reimbursement from you herself. It's nothing personal, just the way she does business. It sounds like there is a discrepancy between how much you and she thinks you owe. I think you should pay her the $200 you think you owe her RIGHT AWAY--has it been long since your phone call to her saying you'd pay this $200? Then call her up and speak to her (don't try to leave a complicated message about finances). Just let her know that you checked your records and thought you only owed $200 and ask for clarification on her $768 figure. If you need to, you could tell her the dates you already paid her this year, the amounts, etc., so she could see that you have paid off her bills. You could also check your checking account to verify that she has cashed all the checks you've written her this month. Maybe she lost a check or it is sitting on her desk under a stack of papers and she just hasn't cashed it.

Once you get the money issue sorted out, you can think whether you want to return to therapy or what. But don't let this money thing fester and come between you. It sounds like a misunderstanding, that's all. You're jumping the gun thinking that this means you can't do therapy with her again. This needn't come between you if you pay and seek clarification right away. If she told you in the past that you only owed $200 then she has probably just made a mistake. Please sort this out for your own sake. You have too much history with this T to let a miscommunication mess things up.