I'm not a tech expert in any sense of the word, Shell Shocked but a Psychiatrist open-minded enough to want to know that information, and willing to incorporate it into a treatment strategy for your child, is very valuable.
I have given, and continue to give, my own son's Out-Patient Therapist, Neurofeedback Therapist, and his Psychiatrist that type of information by email because it is easy, quick, and I can type it up late at night when everyone else is asleep, knowing his Professional(s) will have that information to see the next morning.
Having a Therapist/Psychiatrist keep you in the loop, valuing your insights and opinions and version of reality, is worth its weight in gold... .
I'm really happy that you have this type of Professional involved in your daughter's care, Shell Shocked... .If you feel comfortable that your emails will be safe inside your computer, that your daughter won't access them (if that is your main concern), and that the information will be kept confidential by the Psychiatrist, then maybe it should be all right for you to do?
I've never worried about my son reading what I've written because he can't even get into my laptop to get it fired up; he doesn't know my password (and the question the laptop will ask if it is forgotten is cryptic by my design). If he did ever figure out how to get into it, he doesn't know my password to my email account. Actually, no one but me knows any of that information, so no one but me can access anything I'm doing on my laptop

(No computer whizzes in my family at all... .)