The day of the session is a decision made jointly by the therapist and client. If therapists assigned their clients to days of the week without consulting their clients, they would have a lot of "no shows." Granite, if Monday doesn't work for you, tell her. How about, "T, it turns out Mondays aren't going to work for me after all. What other days and times are available?" You don't have to explain why Mondays don't work, so you don't have to get into the part about how you regret missing all those Monday holidays. You can just keep it very businesslike so you don't have to reveal that you miss those sessions dearly--it seems it is important to you right now not to make yourself vulnerable in that way. I understand. So don't explain why Mondays don't work but do tell her they don't. Then the two of you can pick another day. If she has no other days available at this time, she can put you on a waiting list. It's a business dealing--you don't have to reveal anything personal to her in this conversation.