Holy cow, Gerda. I'm so very sorry that you got that letter. How awful.
I had major depression and PTSD and finally was healed after going through EMDR therapy. It was God-sent. Literally. With that and prayer (serious prayer) I am a new person.
I will pray, too, that you feel God's presence. I don't always so I remind myself that feelings are not the 'truth', they are feelings. They come and go.
I need to read more of your sitch, so I will do that as soon as I can come back on. I'm just so dang sorry that you had that response from your MIL. To be honest, from this view, it says far more about her than you. Maybe she believes that this is a boundary issue for her. After reading this post from you, I felt like I had to stop in and give you some support.
ME47 XH44, S28 S24 S19
8/17-BD IHS: 1/17-2/19 D FILED (ME): 7/19 D FINAL: 10/20 M23 T25 OW CONFIRMED: 01/21
Do not let your hearts be troubled and do not be afraid.