In this instance, it's very difficult for anyone here to know what is a "red flag" or normal because the therapeutic value of what you describe depends very much on tone, wider context, relationship with your therapist, etc and no one here knows these elements of your therapy. For example, your therapist printing out the email is not in itself problematic - even though you experienced shame as a result. I read this as a successful intervention on behalf of your therapist because it brought something into your awareness and you then experienced uncomfortable feelings. The key is whether you were then able to explore those uncomfortable feelings of shame with your therapist and this relies on her being adequately skilled and sensitive. However, if she printed out the email in a punitive way that is very different - and different again is you perceiving her as being punitive when that was not her intention or action.

I think one of the (very many) tricky things about therapy is that are few absolutes and so much of the work is subjective, modality dependent, individualistic, variable, exploratory, inclusive, challenging, upsetting. Outside of obvious red flags like sexual/physical/financial abuse, many of the more challenging aspects of therapy can be categorised as "the work" and seen as a positive area of growth. Where the line is between this challenge and something harmful is not clear - especially because asking outsiders is not always fruitful either because outsiders are not in the room with you. For example, I consider EMDR to be a load of hokum but it is a well established technique and many people, including posters here, are advocates for it.