That's true too. If you aren't comfortable then don't tell her. It's definitely more of a personal decision in this case
And no worries! Slowly and steadily build confidence. Usually when I have to do something difficult my therapist will ask me to imagine doing it and then every time I freeze up from anxiety or fear then I pause and do a breathing exercise and then continue. Don't really know if that'll help you though. What I find more useful is just writing down how I feel and what I think is stopping me. And then try to rationalize it out along with thinking about the best and worst case scenarios. Plus sometimes I ask someone to do it for me. Set it all up and tell them to close their eyes and click the mouse :P that way they don't see the email and I don't have to send it myself hahahahha