I would send a letter rather than email. The other option is to wait and give her the writing at the next appointment if you think you can't just say it to her.
If you email her and she does not respond - are you going to feel worse? Do you want to give her information or do you want reassurance? (It is not bad to want reassurance - but I think it may not be obtained if you send the email.It might get reassurance from the therapist - I am just suggesting it is something to consider)