Is this your current therapist that sent you a response through email? Anything that a therapist "says", should be said face to face; unless it's a crisis situation that needs to be dealt with over the phone.
The most effective way to find out what your therapist "means", is to ask her. Guessing and assuming can only help so much, and it can lead to many little misunderstandings or one big misunderstanding that can work against both of your efforts in your therapy.
I would suggest asking her face to face. When you ask her face to face, if that is possible, I would start out saying, "the message you sent me made me feel confused, so I'd like to know if you could explain a little about it and what it means to you and to our therapy together."
One concern I have from your post; you seem to be worried or a bit self critical of yourself/of how you come across or present yourself to others....if that's true, it would be helpful to talk about that, ONLY when you are ready to talk about it. Never pressure yourself or let your therapist pressure you. Only a true professional therapist will let you take as much time as you need for you to feel as comfortable and safe as possible before you open up and share your most personal private feelings, pain, emotions..etc.
There's no way anyone can know what your therapist means except your therapist; and that's only if she tells the truth. But since your self worth comes first, therapists can't always tell the truth.
Her message seems a bit vague to me, I would ask for her CLARIFICATION on the subject she's pertaining to. About your poems, or about the trauma, or about your therapeutic relationship.
I'm a little worried that she says, "BEFORE opening the trauma dialogue.." It worries me, because a client/patient should be able to open any dialogue they want to anytime they feel comfortable or it's the right time to do so.
Your therapist is there to guide you and give you interpretations when appropriate, BUT they are also there to RESPECT YOUR OWN "TIMING". In other words, it's your therapy, and you have a right to talk about whatever you want to talk about.
Her responsibilities for your self worth and mental health DO NOT include minimizing your own confidence in yourself to be able to bring up a subject that has caused you much pain and distress whenever you yourself would like to talk about it.
Might be wise to remind her that you are capable of feeling and knowing when the "right" time is to talk about things that concern you in the "here and now" in your own therapy. If she doesn't let you talk about what you want to talk about WHEN YOU WANT TO TALK ABOUT IT...then I'd suggest trying to find a new therapist...if that's a possibility for you.
I'd also recommend avoiding "counselors" if you can. They don't have the expertise, knowledge, experience, (professionalism), that a Clinical Psychologist (Ph.d) would have. Counselors can be helpful for more "surface" material; but for "traumas" and other deep seated issues...they're simply not qualified.
And it seems like she's indirectly telling you that you are not containing your emotions within the therapeutic setting (boundaries). You might want to ask her to please be more specific (face to face), when discussing boundaries (telephone calls), leaving messages, emails, regression when not in the therapy room in her presence...etc.
Your poems must be beautiful; poems can be beautiful even when they contain painful emotions. I would encourage you to continue writing, and ask her specifically what the meaning was behind her message.
I wish you the best...I know it's confusing sometimes, or most of the time, (for me), but it's worth it to learn more about yourself and help come to terms with things that have happened and continue to affect you (us)