Ts are human and make mistakes, however it's important you are able to express your feelings within the relationship. I hope you do let your therapist know how it made you feel when she asked you to think about something then prevented you from sharing your thoughts. She is responsible for those actions, and I believe the mark of a good therapist is being able to reflect on their actions honestly and own their mistakes.
As you say, you are quick to blame yourself, but that shouldn't be a get out of jail free card for your therapist to avoid addressing mistakes. I hope she is able to challenge this pattern by realising she has not handled this well and owning that, rather than reinforcing the pattern by allowing you to blame yourself for sabotaging the session.