You think L doesn’t understand “gravity of things” like doesn’t get what marriage entails? Like she just thought it’s putting signatures on paper? That’s a bit unusual way to look at it and she is having a child now. Or is she just downplaying it? It would be really weird if she really had no understanding of seriousness and gravity of life decisions.

Don’t forget that this is her profession and her job and working with a patient with whatever needs (including something that could be perceived as childish) is what she does for a living. It’s like saying why would a doctor want to treat me, I am so sick. Because he’s a doctor and you are in a need of treatmet because you are sick

I think you will do well in her absence especially since you got a therapist lined up and it sounds like it’s also a good t. You are showing lots of growth and you can do it.

I wonder if you give too much thought of what she might think or feel or how things would go for her. She’s your t not the other way around. I’d try to focus on what you need and feel and what steps you could take to remain healthy in her absence-like having another reliable t in her absence and perhaps schedule appts ahead of time